Question

To encourage recycling, many states require a 7¢ deposit on drink containers. The total deposit (d) you pay depends on the number of containers (n) you buy. The function d = 0.07n could be used to describe this situation. If your deposit is $1.40, how many containers did you buy?

Answer 1

d = total deposit
n = number of containers

In this case, we are told d = $1.40.
We need to find n.

Write the given equation.

d = 0.07n

Substitute the information we know, d = 1.40.

1.40 = 0.07n

Solve for n.

Divide both sides by 0.07.

20 = n

n = 20

Answer: 20 containers.