Predict: I predict that this question will be about addition and money.

Read: How much is one book according to the diagram?

Book x2 + Paint pallet = $ 45

Book x4 + Paint pallet = $85

Clarify: I had nothing to clarify in this question.

Mathematician’s toolbox: The strategy I used from the mathematician’s toolbox was to test all possibilities.

Big question: The big question is how much does one book cost.

Solve: Firstly, I started at the first diagram. Two books plus one paint pallet is $45. I tried making them $15 each, but then 5 groups of 15 was more than 85. Then I tried making the books $20 and the paint pallet $5. This worked for $45, and it also worked on $85. So the answer was $20.

Summary: This problem was quite easy to solve, but I’m still surprised that a paint pallet was $5. It must have been bad quality.