A candidate in an examination was asked to find $5/14$ of a certain number. By mistake he found $5/4$ of it. Thus, his answer was 25 more than the correct answer. The number was :
Options:
A . 140
B . 84
C . 56
D . 28
Answer: Option D Answer: (d)Let the required number be x. As given, $x × 5/4$ - $x × 5/14$ = 25$5x(1/4 – 1/14)$ = 25$5x({7 – 2}/28)$ = 25⇒ $5x × 5/28$ = 25x = ${25×28}/{5×5}$ = 28
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