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Properties of Integers

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by Anurag@Gurome » Sat Jan 28, 2012 12:12 am
xtremecoder007 wrote:If x is an integer divisible by 15 and not by 20, then x is not divisible by?
As x is divisible by 15 (= 3*5), x is divisible by both 3 and 5.
Now x is divisible by 5 but not by 20 (= 4*5).

Hence, x is not divisible by 4.
Hence, x will not be divisible by any multiple of 4.
Only such option is 12.

The correct answer is C.
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