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What is the ratio of the component in grade M20 concrete?

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What is the ratio of the component in grade M20 concrete?

(a) 1:3:6

(b) 1:1.5:3

(c) 1:1:2

(d) 1:2:4

The question was posed to me by my college director while I was bunking the class.

My question is taken from Composition of Concrete in chapter Building Construction of Basic Civil Engineering

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Correct choice is (b) 1:1.5:3

The explanation is: Concrete is graded into many types as per IS 456-2000. M stands for mix and the number, say, 20 is a compressive strength after 28 days in N/mm^2.  Generally, M20 grade is used. The ratio of cement: fine: coarse aggregate for M20 is 1:1.5:3.  For M10 it is 1:3:6, M15 it is 1:2:4 and M25 it is 1:1:2.

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