Question

Meghan bought 3 pounds of apples that cost x dollars per pound. she gave the cashier a $20 dollar bill which equation could Meghan use to find the amount of change,y she should receive?

Answer 1

If she got 3 pounds of apples at x dollars per pound, the total cost

= 3x dollars

Since she gave the cashier a $20 bill, the change she will receive is the difference between the $20 bill and 3x hence given that her change is y, this may be expressed as

y = 20 - 3x