4) m25 – in m25 grade of concrete mix ratio is 1: 1 : 2 in which one part is cement 1 part is sand and 2 part is aggregate. calculate quantity of cement sand and aggregate for 10 cubic metre concrete and take m10 grade of concrete. solve; given :wet volume of conc 10 m3. mix ratio in m10 1 :3:6. total proportion 1 3 6 10.