Question

The monthly pocket money of Ravi and Dave are in the ratio 5:7. Their expenditure ratio 1:2. If each saves ₹ 40, find their monthly pocket money.

Answer 1

Answer:

Monthly pocket money of Ravi = Rs. 66.65

Monthly pocket money of Dave = Rs. 93.31

Step-by-step explanation:

Let monthly pocket money of Ravi and Dave be 5x and 7x

Total pocket money = Expenditure + Savings

Total pocket moeny - Savings = Expenditure

$\frac{5x-40}{7x-40} = \frac{1}{2} \\2(5x-40)=7x-40\\10x-80=7x-40\\10x-7x=80-40\\3x=40\\x=\frac{40}{3}= 13.33$

Monthly pocket money of Ravi = 5x = 5 * 13.33 = Rs. 66.65

Monthly pocket money of Dave = 7x = 7 * 13.33 = Rs. 93.31