if 10 litres of an oil of rs . 55 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 ?
55 * 10 = 550 66 * 5 = 330 880 / 15 = 58.66 answer : c
divide(add(multiply(10, 55), multiply(5, 66)), add(10, 5))