Answer :
Determine the volume of box.
[tex]\begin{gathered} V=5\times7\times2 \\ =70 \end{gathered}[/tex]Determine the volume of ball.
[tex]\begin{gathered} V^{\prime}=1\times1\times1 \\ =1 \end{gathered}[/tex]Determine the number of balls in the box.
[tex]\begin{gathered} N=\frac{70}{1} \\ =70 \end{gathered}[/tex]So, 70 baseballs in the Jenny's box.