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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