Grade is the Strength of Concrete. And Concrete ratio (Mix) is the ratio in which the cement, sand and aggregate are present in the concrete.

Like in Grade 15 of concrete the ratio of cement: Sand: Aggregate is 1:2:4

Simillarly,

For,

15 >>>>>>> 1:2:4

20 >>>>>>> 1:1.5:3

25 >>>>>>> 1:1:2

30 >>>>>>>> 1: 0.75:1.5

35 >>>>>>>>> 1:0.5:1

The Chart of Mix ratio of different grade of concrete is given below,

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