income and expenditure of a person are in the ratio 7 : 6 . if the income of the person is rs . 21000 , then find his savings ?
"let the income and the expenditure of the person be rs . 7 x and rs . 6 x respectively . income , 7 x = 21000 = > x = 3000 savings = income - expenditure = 7 x - 6 x = x so , savings = rs . 3000 answer : d"
subtract(21000, multiply(divide(6, 7), 21000))