Answer / nadira abedin

1:2:4,1:3:6,1:1.5:3

Answer / adesh kumar

The ratio of R C C work has to be following mix proportion, that is nominal mix:
Cement:Sand:Aggregate-
 M 15(1:2:4),
 M 20(1:1:5:3),
 M 25(1:1:3)

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