One-step equation word problems: subtraction
Think of an equation for the story, then solve it.
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A tank had some water. After 9 L were used, 2 L were left. How many L were in the tank at first?
Answer: 11
A tank had some water. After 19 L were used, 12 L were left. How many L were in the tank at first?
Answer: 31
A tank had some water. After 15 L were used, 15 L were left. How many L were in the tank at first?
Answer: 30
Tip: Think of an equation for the story, then solve it.
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