The current is defined as:
[tex]i=\frac{Q}{t}[/tex]where Q is the charge and t is the time. In this case we know that the current is 1.5 A and the time is 78 s; plugging these values and solving for Q we have:
[tex]\begin{gathered} 1.5=\frac{Q}{78} \\ Q=78(1.5) \\ Q=117 \end{gathered}[/tex]Therefore, the charge that flowed through the toothbrush is 117 C
