The monthly income of two persons is in the ratio 4:5 and their expenditures are in the ratio 7 : 9. If each saves ₹50 per month, then their monthly incomes are:
Answer & explanation
Correct answer: option 1
Income = Expenditure + Savings.
⇒ A : B
Income 4 : 5
Expenditure 7 : 9
⇒ To make difference between A and B in both ratio, we multiply income ratio with 2,
⇒ (4 : 5) x 2 = 8 : 10.
⇒ Income - Exp. = Savings
8 : 10
7 : 9
1 : 1
⇒ 1 unit = Rs. 50.
⇒ Income of A and B = 8 x 50 = Rs.400, 10 x 50 = Rs.500