He can read [tex]1\frac{7}{8}[/tex] chapters of his history book in 1 hour.
Explanation
Franco read 3/8 of a chapter of his history book in 1/5 of an hour.
Suppose, he can read [tex]x[/tex] chapters of his book in 1 hour at this rate.
So, the equation according to the ratio of 'the chapter to the time' will be....
[tex]\frac{x}{1}= \frac{\frac{3}{8}}{\frac{1}{5}}\\ \\ \frac{x}{1}=\frac{3}{8}*\frac{5}{1}\\ \\ \frac{x}{1}=\frac{15}{8} \\ \\ x= \frac{15}{8}= 1\frac{7}{8}[/tex]
So, he can read [tex]1\frac{7}{8}[/tex] chapters of his history book in 1 hour.
