The band sponsored a car wash. During the first session, the students earned $78. During the afternoon session, they earned $54. That evening when people were on
their way home from work, the students earned $81. If the band charged a whole
dollar amount for each car, what was the charge per car?

i'm not really sure how to answer that

step-by-step explanation:

the given 6 = w/p is equivalent to 6p = w, where w is the total area of the walls and p is the area covered by a single can of paint.

knowing that 6 cans of paint will be needed, 6p = w becomes 6(6) = w = 36.   this tells us that the total area to be painted is 36 square units.