Subject: General Aptitude · Chapter: Ratio and Proportion · Exam: 2010 · Marks: · Difficulty:
Three numbers $A, B$ and $C$ are in the ratio of 12 : 15 : 25. If the sum of these numbers is 312, the ratio between the difference of $B$ and $A$ and the difference of $C$ and $B$ is
(a)3 : 7
(b)5 : 1
(c)3 : 10
(d)10 : 3
Answer
Answer (as printed): C
Explanation
$A: B: C=12: 15: 25$. Let the numbers be $12 x, 15 x$ and $25 x$. Required ratio $=(B-A):(C-B)=(15 x-12 x)$ : $(25 x-15 x)=3 x: 10 x=3: 10$.
Explanation as extracted from the printed page; notation may be imperfect.