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P & Q do a piece of work in 20 days. P has worked for 15 days ;Q finished the remaining work in 21 days. In how many days P can do alone?

A takes twice as much time as B & thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2days. The number of days required by B to do the work alone is......?

12/2/1908 is in which day..?

How to make a good command over simplification and approximation.

How can  I solve mensuration 

how many question will be required to attempt in maths to qualified  the exam?