if 10 litres of an oil of rs . 54 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 ?
"54 * 10 = 540 66 * 5 = 330 870 / 15 = 58 answer : b"
divide(add(multiply(10, 54), multiply(5, 66)), add(10, 5))