The ratio of monthly incomes of Pawan and Sunil is 4 : 3 and the ratio of their monthly expenditures is 3 : 2. If Pawan and Sunil save ₹ 4000 and ₹ 6000 respectively per month, then what is the sum of their monthly incomes?

₹ 70000

4x - 3y = 4000    ..(1.)

3x - 2y = 6000    ..(2.)

⇒ (1) x 2 - (2) x 3

⇒ 8x - 6y - 9x + 6y = 8000 - 18000

⇒ -x = -10,000,

⇒ x = 10,000

⇒ 4x + 3x = 7x 

⇒ 7 x 10,000 = 70,000.