if 10 litres of an oil of rs . 40 per litres be mixed with 5 litres of another oil of rs . 66 per litre then what is the rate of mixed oil per litre ?
"40 * 10 = 400 66 * 5 = 330 730 / 15 = 48.66 answer : a"
divide(add(multiply(10, 40), multiply(5, 66)), add(10, 5))