Question

Frances can complete 91 oil changes in 7 days.

How many oil changes can Frances complete in 11 days?

Answer 1

143 oil changes

Explanation:

We first find the unit rate.

(91 oil changes)/(7 days) = 13 oil changes/day

Since we want to know the number of oil changes in 11 days, we multiply the unit rate by 11 days.

13 oil changes/day * 11 days = 143 oil changes