Question

is the hour X or is the money X?the proceeds from a carwash are directly proportional to the number of cars washed. The total after 9 cars was $180 . How much can be raised a 60 cars were washed?

Answer 1

`\begin{gathered} \text{let} \\ y=\text{proceed from a car wash} \\ x=\text{ numbers of car washed} \\ y=kx \\ \text{where} \\ k=\text{constant of proportionality} \\ y=kx \\ 180=9k \\ k=(180)/(9) \\ k=20 \\ \text{amount raise when 60 cars is washed can be solved as follows} \\ y=kx \\ x=60 \\ y=20*60 \\ y=1200 \end{gathered}`

amount raised = $ 1200