Answer / mallikarjun rao

In this Question M stands for Mix design and 50 or 30 stands for strength i.e 50N / Sq.mm and 30N / Sq.mm.

Answer / dhuvaragancivil

M stands for Mix
50 and 20 stands for compressive strength of the concrete cube after 28 days curing is 50N/mm^2 and 20N/mm^2
cube size 15cm×15cm×15cm

Answer / varun shukla

It represents the compressive strength after 28 days of curing in N/mm^2

Answer / ashutosh gupta

M is Mix Design & 20, 30 or 50 resembles Characteristic Compressive Strength of concrete after 28 days of curing in MPa or N/mm2

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