What is the ratio of Grades M5, M7.5, M10, M15, M20, M25, M30, M35, M40?

What is the ratio of Grades M5, M7.5, M10, M15, M20, M25, M30, M35, M40?

This a good question also plz explain with the name of concrete class with grades like Class B, Class A, Class D1, Class D2
 
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