Let A′s and B 's monthly income be 8x and 5x, and expenditure be 5y and 3y ∴8x−5y=12000 and 5x−3y=10000 From Eqs. (i) and (ii), we get x=14000 and y=20000 ∴ A's income =8x=8×14000=₹112000 B's income =5x=5×14000=₹70000 ∴ Difference =112000−70000=₹42000