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Mary is 21 years old. Her age is 9 years more than 3 times Henry’s age. Which equation can be used to determine x, Henry’s age in years?
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1 vote
Mary is 21 years old. Her age is 9 years more than 3 times Henry’s age. Which equation can be used to determine x, Henry’s age in years?

User Sheina
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1 Answer

5 votes
21-9=12
12/3=4
Henry is 4

User Invariant
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