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It depends on the required grade of concrete, you need to know the particular grade.

The three grades specify the ratios of Cement : Stone : Sand.

M15 = M150 = 1 : 2 : 4

M20 = M200 = 1 : 1.5 : 3

M25 = M250 = 1 : 1 : 2

As you can see there is always two parts sand to one part stone. Higher grades have more cement. So the ratio of stone to the whole is 2:7, 3:11, and 1:4. The percentages are 28.6%, 27.3%, and 25.0%.

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