Question

The monthly pocket money of Ravi and
Sanjeev are in the ratio 5 : 7. Their
expenditures are in the ratio 3 : 5. If each
saves 80 every month, find their monthly
pocket money.
[2012]​

Answer 1

Step-by-step explanation:

$let \: income \: be \: x \\ and \: expence \: be \: y \\ savings = 80 \\ 5x - 3y = 80 \: \: \: (1) \\ 7x - 5y = 80 \: \: \: (2) \\ solve \: the \: equation \\ y = 40 \\ x = 40$