Question

I just need an answer on how much she needs and an explanation on how to answer the problem

Answer 1

1 can of paint will cover 40 square feet

x can of paint will cover 125square feet.

If we cross multiply it we will get

$\begin{gathered} 40x=125 \\ x=\frac{125}{40} \\ x=3.125\text{ cans} \\ \text{But since Sam can only buy whole cans, She will ne}ed\text{ 4 cans to finish } \\ \text{her work.} \end{gathered}$

She needs 4 cans

She cannot buy 3.125cans, so we have to round up our answer to the next

whole number which is 4.