During summer vacation, you charge people $8 per hour for swimming lessons and a $20 registration fee. if you make $52 one day, how many hours did you spend teaching lessons?

I think the answer would be "I spent 4 hours teaching lessons".

First take 52 and minus 20
Then take 32 and divide it by 8 which equals 4

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.