Answer :
Percentages
We want to know how many pounds are the 15% of 500 pounds
In this case 500 would correspond to the 100%. Then we have the following equivalence:
15% → ?
100% → 500 pounds
If we divide each side of the equivalence we have the same result:
[tex]\begin{gathered} \frac{15}{100}=\frac{?}{500} \\ 500\cdot\frac{15}{100}=\text{?} \\ 5\cdot15=\text{?} \\ 75=\text{?} \end{gathered}[/tex]Then, the chef used 75 pounds
He has left 500 pounds - 75 pounds = 425 pounds