if 10 litres of an oil of rs . 50 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 ?
"50 * 10 = 500 66 * 5 = 330 830 / 15 = 55.33 answer : d"
divide(add(multiply(10, 50), multiply(5, 66)), add(10, 5))