To find out how many copies could be made for $25 at a rate of 20 copies for $5, set up a proportion and solve for x. The answer is 100 copies.
Step-by-step explanation:
To find out how many copies could be made for $25 at a rate of 20 copies for $5, we can set up a proportion. Let x represent the number of copies that can be made for $25.
Proportion: 20/5 = x/25
To solve for x, cross-multiply: 20 * 25 = 5 * x
Simplify: 500 = 5x
Divide both sides by 5: x = 100
Therefore, 100 copies could be made for $25.