Question

the annual incomes of A and B are in the ratio 3:4 and their annual expenditures are in the ratio 5:7. If each saves Rs.5,000; find their annual incomes.

Answer 1

Incomes          Expenditures
 A:B                       A:B
 3;4                         5:7
dif 4-3=1                  dif 7-5=2

Multiply this 1 with 5:7 and multiply this 2 with 3:4 and their common difference is 1 then their savings  1=5000 5000*12=60,000

Answer 2

Incomes          Expenditures
 A:B                       A:B
 3;4                         5:7
dif 4-3=1                  dif 7-5=2

Multiply this 1 with 5:7 and multiply this 2 with 3:4 and their common difference is 1 then their savings  1=5000 5000*12=60,000