Subject: General Aptitude · Chapter: Ratio and Proportion · Exam: E.S.I.C. 2007
$\frac{3}{4}: \frac{1}{2}:: 27 y:$ ?
(a)$12 y$
(b)$18 y$
(c)$21 y$
(d)$24 y$
(e)None of these
Answer
Answer (as printed): B
Explanation
Let the missing number be $x$. Then, $\frac{1}{3}: \frac{1}{2}:: 27 y: x \Leftrightarrow \frac{3}{4} x$ $=\frac{1}{2} \times 27 y \Leftrightarrow x=\frac{27 y}{2} \times \frac{4}{3}=18 y$.
Explanation as extracted from the printed page; notation may be imperfect.