Problem-Solving Strategy: Work Backwards. ExampleSam needs to know how much money he had before he began his spending spree. He spent $5.98 on food, $6 on a movie, and $47.34 on a pair of shoes. Then his mother gave him $20 to buy groceries. The groceries totaled $17.95. If Sam has $5 left, how much money did Sam start with?.
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