A
rectangle is 14 cm long and 10 cm wide. If the length is reduced by x
cms and its width is increased also by x cms so as to make it a square.
Find the change in the area.

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An
empty swimming pool can be filled to capacity through an inlet pipe in 3
hours, and it can be completely drained by a drainpipe in 6 hours. If
both pipes are fully open at the same time, in how many hours will the
empty pool be filled to capacity?

A
father is three times as old as his son. After fifteen years the father
will be twice as old as his son's age at that time. What is the
father's present age?