The general ratio of cement : sand: aggregate in nominal mix M20 grade concrete is:
A
1:2:4
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B
1:1.5:3
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C
1:3:6
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D
1:1:2
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Solution
The correct option is B1:1.5:3 Letter M in concrete refers to a mix of concrete and the numbers thereafter denote the compressive strength of concrete after 28 days.