Question

Mr. Buchanan makes $20 per hour when he tutors after school. If he needs to make $110 for anew motorcycle helmet, how long does he need to work?

Answer 1

Mr. Buchanan earns $20 in 1 hour.

To find how many hours he needs to earn $110, we can use the next proportion:

`\frac{20\text{ \$}}{110\text{ \$}}=\frac{1\text{ hour}}{x\text{ hours}}`

Solving for x,

`\begin{gathered} 20\cdot x=1\cdot110 \\ x=(110)/(20) \\ x=5.5\text{ hours} \end{gathered}`

He needs to work 5.5 hours.