Question

A factory contains a series of water tanks, all of the same size .If pump 1 can fill 12 of these tanks in a 12-hour shift and pump 2 can fill 11 tanks in the same time ,then how many tanks can the two pumps fill,working together in 1hour?​

Answer 1

$$\begin{gathered} Pump1canfill12\tan ksin12hours \\ numberof\tan ksthatpump1willfillin1hour=\frac{12}{12}=1 \\ Pump2canfill11\tan ksin12hours \\ numberof\tan ksthatpump2willfillin1hour=\frac{11}{12} \\ Totalnumberof\tan kthatbothpumpscantogetherfillin1hour=1+\frac{11}{12}=1\frac{11}{12} \end{gathered}$$