You can solve this by cross multiplying. Set up two ratios of how many pounds of apples over how many pies.
[tex] \frac{2}{5} [/tex] = [tex] \frac{x}{20} [/tex] Cross-multiply
5x = 2 (20) Multiply
5x = 40 Divide
x = 8
You need 8 pounds of apples to make 20 pies.
