Concrete Mix designs for M15,M20,M25,M30 and M35.. Answer / sabir. M20=50-138-185 (kg) 22.5ltr water ... Super flow 6.7% of cement as per CPWD M15=240Kg, M20=320Kg, M25=330Kg, M30=340Kg, M35=350Kg CEMENT FOR RMC . Is This Answer Correct ? ... in m30 how to mix concrete exampal cement sand jall water propostion please tell me. Is This Answer ...