The monthly salaries of Ravi and Joseph are in the ratio $3 : 4$, and those of Joseph and Harpreet are in the ratio $6 : 5$. Together the three earn ₹77,500 a month. What is Harpreet's salary?

Explanation

1. 01

   Make Joseph's term equal: $3 : 4 = 9 : 12$ and $6 : 5 = 12 : 10$.

2. 02

   Ravi : Joseph : Harpreet = $9 : 12 : 10$, a total of 31 parts.

3. 03

   One part = ₹77,500 ÷ 31 = ₹2,500, so Harpreet earns 10 × ₹2,500 = ₹25,000.