Question

I solved 21 math questions in 3 1/2 hours. How many will I answer at the 6 hour math competition

Answer 1

I solved 21 math questions in 3 1/2 hours. How many will I answer at the 6 hour math competition= like 36

Answer 2

Two large and 1 small pumps can fill a swimming pool in 4 hours. One large and 3 small pumps can also fill the same swimming pool in 4 hours. How many hours will it take 4 large and 4 small pumps to fill the swimming pool.(We assume that all large pumps are similar and all small pumps are also similar.)