Explanation
Step 1
Let
C represents the total of children at the aquarium ,
then
when you have a whole number ( 63 in this case) and you need to find the proportion, you need to multiply
[tex]\begin{gathered} \text{total of Childrend=63}\cdot\frac{5}{7}\rightarrow C=63\cdot\frac{5}{7}(equation) \\ \text{total of Childrend=}45 \\ C=45 \end{gathered}[/tex]so, the total of children is 45.
I hope this helps you