Q13 REPRESENTATIONS

Let a, b, c, d and e be integers such that a = 6b = 12c, and 2b = 9d = 12e. Then which of the following pairs contains a number that is not an integer ?

a. a/27, b/e

b. a/36, c/e

c. a/12, bd/18

d. a/6, c/d

The correct option is D

Assumption

Start with e. if e=12, then c=36, d=16, b=72 and a=432

Now you can eliminate answer options. All the options, other than option (d) give integral values.

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