Q.The ratio of the capital invested by three people is 4:7:9, and the profit of the first person is ₹100 less than the profit of the third person. What is the amount of profit earned by the second person?
Profit ratio = Capital ratio
Let the profits of the three persons be ₹4x, ₹7x, and ₹9x respectively.
Therefore, according to the question:
\(9x - 4x = 100\)
⇒ \(5x = 100\)
⇒ \(x = 20\)
So, the profit of the second person = \(7x = 7 × 20 = ₹140\)