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If twice Mary’s age is decreased by 7 is the same as her age increased by ten. How old is Mary? Be sure to use the four-step problem solving process!

1 Answer

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Answer: 17 years

Explanation:

Let mary's age be m

2m-7 = m+10

Subtracting m from both sides:

m-7 = 10

Therefore, m = 17

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