SOLUTION: Members of a senior class held a car wash to raise funds for thier senior prom. They charged $3 to wash a car and $5 to wash a truck. If they earned a total of $275 by washing a to

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: Members of a senior class held a car wash to raise funds for thier senior prom. They charged $3 to wash a car and $5 to wash a truck. If they earned a total of $275 by washing a to      Log On


   

Question 192304: Members of a senior class held a car wash to raise funds for thier senior prom. They charged $3 to wash a car and $5 to wash a truck. If they earned a total of $275 by washing a total of 75 vehicles,how many cars did they wash?
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Let x represent the number of cars washed. Then, since 75 vehicles were washed, the number of trucks washed must have been 75 - x.

Since they charged $3 per car, the amount of money they made from washing cars was 3x. Likewise, the amount of money they made from washing trucks was

The total of these two amounts must be the total amount they made, so:



Solve for x to get the number of cars washed.

John