SOLUTION: Mary sold 13 books, each for the same price, and used part of the money to buy a sweater that cost $17 (tax included). She had $22 left. What was the price of each book?

Question 258315: Mary sold 13 books, each for the same price, and used part of the money to buy a sweater that cost $17 (tax included). She had $22 left. What was the price of each book?
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
Mary sold 13 books, each for the same price, and used part of the money to buy a sweater that cost $17 (tax included). She had $22 left. What was the price of each book?
.
Let x = cost of each book
then
"total profit from books" - "cost of sweater" = "amount left"
13x - 17 = 22
13x = 39
x = $3

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