​what does M/20 or N/10 mean in molarity concentration?

Dear student,
M/20 represents a 0.05 Molar solution means there are 0.05 number of moles dissolved per litre of the solution.
N/10 solution a decinormal or a 0.1 normal solution which means there 0.1 gram equivalents dissolved per litre of the solution
 

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IS 456-2000 has designated the concrete mixes into a number of grades as M10, M15, M20, M25, M30, M35 and M40. In this designation the letter M refers to the mix and the number to the specified 28 day cube strength of mix in N/mm2. The mixes of grades M10, M15, M20 and M25 correspond approximately to the mix proportions (1:3:6), (1:2:4), (1:1.5:3) and (1:1:2) respectively.
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