AlgebraEasyStamps after buying more
Algebra practice question
Omar had some stamps. After buying 7 more he had 19. How many stamps did he have to begin with?
Answer: 12
s + 7 = 19 gives s = 12.
Common wrong answers
- If you answered 7
- 7 is the number bought.
- If you answered 19
- 19 is the total afterwards.
- If you answered 26
- 26 adds 7 instead of subtracting.
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