Answer / dsp

The mixes of grades M10, M15, M20 and M25 correspond approximately to the mix proportions (1:3:6), (1:2:4), (1:1.5:3) and (1:1:2) respectively.

Answer / abhinav saxena

mix grades of M5,M10,M15,M20,M25...(1:4:8),(1:3:6),(1:2:4),(1:1.5:3),(1:1:2) respectively.and the mix for M30,M35,M40 is decided by the designer.
M30,M35,M40 are design mix.

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