Chapter 2: Linear Equations

2.8 The Mystery X Puzzle

The centre number of each square is found by using the order of operations on the numbers that surround it. The challenge is to solve for the variable [latex]X.[/latex]

Box 1: 21 is surrounded by 3, 5, 6. Box 2: 42 is surrounded by 11, 3, 9. Box 3: 64 is surrounded by 5, 12, X.

Can you solve for [latex]X[/latex]? Can you find any other possible solution?

Answer Key 2.8

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