Question 1202009
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The debate team washed cars to raise money for a trip. 
They charged $8 for a large car and $5 for a small car. 
All together they raised $550 and washed 80 cars. 
How many of each type of car did they wash?
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Let x be the number of large cars; then (80-x) is the number of small cars.

Write the total money equation (for the revenue)

    8x + 5*(80-x) = 550  dollars.


Simplify and find x

    8x + 400 - 5x = 550

    8x - 5x = 550 - 400

       3x   =    150

        x   =    150/3 = 50.


<U>ANSWER</U>.  50 large cars and 80-50 = 30 small cars.
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Solved.