Answer / Ram Pal

The letters C, M, and B represent various strengths of concrete as defined by the compressive strength (MPa) at 28 days after curing:
1. C stands for normal concrete, with a compressive strength ranging from 15 MPa to 30 MPa. Examples include C15, C20, C25, etc.
2. M stands for medium concrete, with a compressive strength ranging from 10 MPa to 15 MPa. Example: M15.
3. B stands for high-strength concrete, with a compressive strength greater than 30 MPa. Examples include B35, B40, etc.

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