Shari and Ana are playing games at an arcade. Shari has $37.50 and is playing $0.50 games. Ana has $42.75 and is playing $0.75 games. Sandor wants to know when Shari and Ana will have the same amount of money remaining. So he wrote and solved this equation.

Let x = number of games played.

Equation: 37.50 -.5x = 42.75 -.75x

Step 1: 37.50 - 1.25x = 42.75

Step 2: - 1.25x = 5.25

Step 3: - 4.2 = x

Sandor knows his answer is incorrect because a negative number of games cannot be played. What was Sandor's mistake?

Question

22 September, 11:38

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Answers (1)

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Laila Richmond · Answer 1

He used the subtract inverse when it was supposed to be additive inverse.