Question

after paying $9 for the pie Sally has $99 left how much money did she have before buying the pie

Answer 1

Sally pays $9 for a pie and has $99 left. Then, the money before buying the pie is represented by the sum of $9+$99

$\begin{gathered} \text{money before the pie=\ 9+\ 99} \\ \text{money before the pie}=\text{\ }108 \end{gathered}$

Therefore, she had $108 before buying the pie.