The monthly income of two persons is in the ratio 4 : 5 and their expenditures are in the ratio 7 : 9. If each saves Rs.50 per month, then their monthly incomes are:
Answer & explanation
Correct answer: option 2
I : II
Income 4 : 5
Expenditure 7 : 9
___________________
Savings = -50 -50 (Income - Expenditure)
$\frac{4R\;-\;50}{5R\;-\;50} = \frac{7}{9}$
Using cross - multiplication method,
⇒ 36R - 35R = (-50 x 7) - (-50 x 9)
⇒ R = 100
Their income = 400, 500