Question

The amount of water in a river changes by negative 3 5/8 ft in 4 1/2 hours. What is the average change in the River water level each hour?

Answer 1

we have:

3 5/8 ft ----> 4 1/2 hours

x ft ----------> 1 hour

$\begin{gathered} 3\frac{5}{8}\times1=x\times4\frac{1}{2} \\ \frac{29}{8}=\frac{9}{2}x \\ \frac{29}{8}\times\frac{2}{9}=\frac{9}{2}x\times\frac{2}{9} \\ x=\frac{29}{36} \end{gathered}$

answer: 29/36 is the average change in the River water level each hour