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Wednesday, June 17, 2009
Problem 51 - GMAT Number Properties
How many multiples of 2 or 5 are there between 20 and 80, inclusive?
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Answer iS A there are 37 multiples of 2 and 5
ReplyDelete20,22,24...80
ReplyDeleteTn= a+(n-1)2
n=31
Multiples of 5 not listed above are:
25,35,45,55,65,75
Total: 31+6=37
its a typical set problem
ReplyDeleteA) multiples of 2 = (80-20/2) +1 = 31
B) multiples of 5 = (80-20/5) +1 = 13
C) multiples of 2 & 5(ie 10) = (80-20/10) + 1 = 7
total no of multiples = A+B-C = 31+13-7 = 37 OA A