For the following questions answer them individually
What is the target mean strength $$ (N/mm^2) $$ of the M30 grade concrete, if the standard deviation is 5.0 ?
According to the IS specifications, initial setting time of the ordinary Portland cement should be ___.
If one cement bag has $$ 0.035m^3 $$ volume of cement, the number of bags required for one tonne of cement is _______.