Question

Monthly incomes of A and B are in ratio 4:5 and their expenditure is in ratio 5:3. They save Rs 4000 each. Find their monthly income.

Answer 1

Step-by-step explanation:

Let their monthly income be 5x,4x respectively.

Let their monthly expenditure be 9y,7y respectively.

5x−9y=500 ……….(1)

4x−7y=500 ………(2)

From (1) and (2)

5x−9y=4x−7y

y=

2

x

From (1),

5x−9×

2

x

=500

Or, x=1000

Their monthly income is 5000 and 4000 respectively.