You put $2,200 into an investment yielding 6% simple annual interest; you left the money in for two years. How much simple interest do you get at the end of those two years?

the correct answer is 5

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.

what is the question?