Wednesday, June 17, 2009

Problem 51 - GMAT Number Properties

How many multiples of 2 or 5 are there between 20 and 80, inclusive?

(A) 37
(B) 39
(C) 41
(D) 42
(E) 44

Sunday, June 14, 2009

Problem 49 - GMAT Work

Machine A can manufacture 1200 widgets in 4 hours and Machine B can manufacture the same number of widgets in 5 hours. After working together at their respective rates for 2 hours in order to fill a 1200 widget lot, what fraction of the lot still remains to be manufactured?

Problem 48 - GMAT Combinatorics

How many different handshakes are possible if six girls are standing on a circle and each girl shakes hands with every other girl except the two girls standing next to her?

(A) 12
(B) 11
(C) 10
(D) 9
(E) 8

Problem 47 - GMAT Combinatorics

In how many ways can five girls stand in line if Maggie and Lisa cannot stand next to each other?

(A) 112
(B) 96
(C) 84
(D) 72
(E) 60

Saturday, June 13, 2009

Problem 46 - GMAT Number Properties

Problem 45 - GMAT Number Properties

Is pqr < 0 ?

(1) r < 0

(2) pq > 0

Problem 44 - GMAT Work

Five workers can manufacture 60 widgets in 6 days. Working at the same rate, how many more workers will be needed to manufacture 120 widgets in 4 days?

(A) 3
(B) 4
(C) 5
(D) 10
(E) 15

Problem 43 - GMAT Probability

A teacher will pick a group of 4 students from a group of 8 students that includes Bart and Lisa. If one of all the possible four-student groups is picked at random, what is the probability of picking a group that includes both Bart and Lisa?

Problem 42 - GMAT Powers & Roots

Thursday, June 11, 2009

Problem 41 - GMAT Overlapping Sets

If 20 percent of the students at a certain school went to a camping trip and took more than $100, and 75 percent of the students who went to the camping trip did not take more than $100, what percentage of the students at the school went to the camping trip?

(A) 95
(B) 90
(C) 85
(D) 80
(E) 75

Wednesday, June 10, 2009

Problem 40 - GMAT Number Properties

If p and q are positive integers, and the remainder obtained when p is divided by q is the same as the remainder obtained when q is divided by p, which of the following is a possible value of pq?

(A) 62
(B) 55
(C) 42
(D) 36
(E) 24

Problem 39 - GMAT Overlapping Sets

At a certain party attended by 120 people, one-third of the people are women and one-half of the women are students. If the number of students at the party is 4 times the number of men who are not students, how many of the people at the party are students?

(A) 20
(B) 30
(C) 40
(D) 60
(E) 80

Problem 38 - GMAT Speed

Problem 37 - GMAT Combinatorics

Six Canadian and 6 Mexican delegates attend an international trade conference. A three-delegate committee will be selected from the 12 delegates. How many three-delegate committees can be formed if each possible committee must include at least one Mexican delegate?

A) 260
B) 240
C) 220
D) 200
E) 20

Problem 36 - GMAT Probability

Problem 35 - GMAT Powers & Roots

If x is a positive integer, which of the following could NOT be the square of x?

(A) 5,008,644
(B) 5,004,169
(C) 4,999,696
(D) 4,995,225
(E) 4,990,752

Monday, June 8, 2009

Problem 34 - GMAT Statistics

Set C is a set of positive integers where 4 is least. If the average (arithmetic mean) of C equals its range, then how many positive integers does set C have?

(1) The elements in C are consecutive integers.

(2) The average (arithmetic mean) of C is 8.

Problem 33 - GMAT Number Properties

Problem 32 - GMAT Combinatorics

Juan and his five friends will sit on six fixed seats around a circular table. If Juan must sit on the seat closest to the window and Jamal must sit next to Juan, in how many can Juan and his five friends sit?

(A) 20
(B) 24
(C) 48
(D) 72
(E) 120

Tuesday, May 5, 2009

Problem 30 - GMAT Combinatorics

In how many different arrangements can six trees be planted on the circumference of a circular garden if two arrangements are considered different when the positions of the trees are different relative to those of the others?

A) 720
B) 180
C) 160
D) 120
E) 60

Problem 29 - GMAT Geometry

How many diagonals does a polygon of nine sides have?

(A) 72
(B) 54
(C) 36
(D) 27
(E) 24

Monday, May 4, 2009

Problem 28 - GMAT Coordinate Geometry

In the coordinate system above, line segments BC and AC are parallel to the x and y axes, respectively. If line segment AB has length 30 and is on a line that has slope 4/3, what is the length of BC?

(A) 28
(B) 24
(C) 21
(D) 18
(E) 15

Problem 27 - GMAT Coordinate Geomery

In a coordinate system, points A and B have xy-coordinates (5, 2c) and (6, c^2), respectively. If points A and B lie on line k, which has slope 8, then c could equal

(A) -4
(B) -3
(C) 1
(D) 2
(E) 4

Problem 26 - GMAT Coordinate Geometry

In a coordinate system, line l is parallel to line k, does line l intersect the x-axis?

(1) Line k has slope zero.

(2) Point (0, 4) is on line k.

Problem 25 - GMAT Coordinate Geometry

In a rectangular coordinate system, if a and b are positive integers, is point (a, b) above line y = x?

(1) a = 4

(2) b = a + 2

Problem 24 - GMAT Powers & Roots

A perfect square is defined as the square of an integer and a perfect cube is defined as the cube of an integer. How many positive integers n are there such that n is less than 1,000 and at the same time n is a perfect square and a perfect cube?

(A) 2
(B) 3
(C) 4
(D) 5
(E) 6

Sunday, May 3, 2009

Problem 23 - GMAT Powers & Roots

Problem 22 - GMAT Geometry

An equilateral triangle of side 12 is inscribed in a circle, what is the area of the circle?

Problem 21 - GMAT Powers & Roots

(A) 5
(B) 4
(C) 3
(D) 2
(E) 1

Problem 20 - GMAT Number Properties

If (p - q) is not equal to zero, what is the value of p/(p - q)?

1) 13p - 11q = 0

2) 13 - p = 11 + q

Problem 19 - GMAT Number Properties

Which is the smallest positive integer y such that 120y is the square of an integer?

(A) 10
(B) 15
(C) 30
(D) 60
(E) 90

Problem 18 - GMAT Number Properties

If positive integer x is divided by 5, the result is p and the remainder 3. If x is divided by 11, the remainder is 3 again, what is the remainder when p is divided by 11?

(A) 0
(B) 1
(C) 2
(D) 3
(E) 4

Problem 17 - GMAT Powers & Roots

What is the value of x if x is the units digit of 3^23 - 3?

A) 0
B) 2
C) 4
D) 6
E) 8

Problem 16 - GMAT Number Properties

If 34 books are picked from a box and distributed among a group of students, which of the following is NOT a possible number of students in the group if after giving each student the same number of books the number of books put back in the box is two less than the number of students?

(A) 6
(B) 9
(C) 10
(D) 12
(E) 18

Problem 15 - GMAT Overlapping Sets

If 20% of the people at a college party were men who were wearing red t-shirts, and 60% of the men at the party were not wearing redt t-shirts, what percent of the people at the party were men?

(A) 80 %
(B) 60 %
(C) 50 %
(D) 40 %
(E) 33 1/3 %

Problem 14 - GMAT Algebra

Mike can do a maximum of 4000 push-ups a week. His "fitness" index is given by the equation F = (2/5) (3000 - p)(p - 60), where F is his fitness index and p is the number of push-ups Mike does during one week. Which of the following represents the number of weekly push-ups that will maximize his fitness index?

(A) 1530
(B) 1580
(C) 3000
(D) 3100
(E) 3200

Problem 13 - GMAT Mixtures

Jamal and Mary read a total of 100 books and no book was read by both of them. If Jamal found 40% of the books he read boring and Mary found 50% of the books she read boring, and together they found 44% of the 100 books boring, what percent of the 100 books was read by Mary?

(A) 66 2/3 %
(B) 60 %
(C) 58 %
(D) 48 %
(E) 40 %

Saturday, May 2, 2009

Problem 12 - GMAT Speed

Yolanda walks from her home to school at 4 miles per hour; she then rides her bike back home by the same route at c miles per hour. What is Yolanda’s average speed for the round trip?

1) The distance from Yolanda’s home to her school is 6 miles.

2) c = 10

Problem 11 - GMAT Geometry

What is the largest possible area of a rectangle that has sides of integer length and perimeter 28?

(A) 50
(B) 49
(C) 48
(D) 45
(E) 40

Problem 10 - GMAT Number Properties

Is positive integer x even?

(1) The greatest prime component of x is 13.

(2) The least prime component of x is 7.

Problem 9 - GMAT Work Problem

If Tom and Huckleberry working at their respective rates can each whitewash 600 square feet of fence in x and y hours, respectively, how long will it take both of them working together at their own rates to whitewash 600 square feet of fence?

(1) x - y = 1

(2) (xy)/(x + y) = 6/5

Problem 8 - GMAT Number Properties

Problem 7 - GMAT Speed

Juan drives all the way from his office to his girlfriend’s house at an average speed of 20 miles per hour, he drives back to his office by the same route. If he wants to average 24 miles per hour for the round trip, at what average speed should he drive home?

(A) 25
(B) 26
(C) 28
(D) 29
(E) 30

Friday, May 1, 2009

Problem 6 - GMAT Work

It takes Peter 4 hours to complete one half of a certain job working alone. It takes Peter and Mike, working together at their respective rates, 3 hours to do one half of the same job. How long does it take Mike, working alone at his rate, to complete the same job?

(A) 24
(B) 20
(C) 16
(D) 12
(E) 8

Problem 5 - GMAT Overlapping Sets

At a college party, 70% of the women are wearing red t-shirts. If 60% of the people at the party are wearing red t-shirts, what is the ratio of women to men at the party?

1) Forty percent of the men at the party are wearing red t-shirts.

2) There are 120 people at the party.

Problem 4 - GMAT Number Properties

How many different factors does 120 have, excluding 1 and 120?

(A) 12
(B) 13
(C) 14
(D) 15
(E) 16

Problem 3 - GMAT Combinatorics

To form a six-people case competition team, a business school professor is to choose 3 female and 3 male students from a group of male and female students. If there are 7 male students in the group and 140 different six-student teams are possible, how many female students are there in the group?

A) 4
B) 7
C) 10
D) 14
E) 20

Problem 2 - GMAT Powers & Roots

10^180 - 10^30 =
Which of the following best approximates the value of the expression above?
(A) 10^180
(B) 10^179
(C) 10^170
(D) 10^160
(E) 10^150

Sunday, December 28, 2008

Problem 1 - GMAT Powers & Roots

Points R, S, T, U, V, W, and X lie from left to right on a number line. The distances between any two consecutive points are equal. If R = -(2^12), and
S = -(2^10), which of the points equals 2^13?

(A) T
(B) U
(C) V
(D) W
(E) X