Income and expenditure of a person are in the ratio 5 : 4. If the income of the person is Rs. 18000, then find his savings.

Rs. 3600

Let the income and the expenditure of the person be Rs. 5x and Rs. 4x respectively.
Income, 5x = 18000 => x = 3600
Savings = Income - expenditure = 5x - 4x = x
So, savings = Rs. 3600.