engineering recuitment WBPSC JE Civil Mock Test 2022 Construction Materials and Management Concrete

M 20 grade of concrete is approximately:

1
1 ∶ 3 ∶ 6 mix 
2
1 ∶ 1 ∶ 2 mix 
3
1 ∶ 1.5 ∶ 3 mix 
4
1 ∶ 2 ∶ 4 mix 
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