On Tuesday, Donovan earned $9 for 2 hours of babysitting. On Saturday, he babysat for the same family and earned $31.50. How many hours did he babysit on Saturday?
[tex]2h=\$9[/tex] [tex]1h=\$4.5[/tex] then we have to divide [tex]31.5[/tex] by [tex]4.5[/tex] [tex]31.5/4.5=\frac{31.5}{4.5}=7[/tex] it means Donovan babysit children of this family for 7 hours