I googled one that doesn't provide an answer and I am about to attempt to do it now:
Poster Prices:
12" x 18" = $7
24" x 36" = $9
41" x 20" = $11
The Poster Palace at the mall is offering a special sale on their posters: “Buy two posters, and the cost of one is reduced by a dollar.†Chaya, Emma, Juanita, Travis, and Whitney each bought two posters and spent a total of $85.
* Whitney bought two different-size posters, but they were not the same combination as those Travis or Chaya bought.
* Chaya spent $17 on two different-size posters.
* The two posters Travis bought cover 1,080 square inches.
* Emma spent the most, purchasing two posters of the same size.
How much money did each person spend, and what size posters did they buy?