SOLUTION: Mary's sister is 7 years older than mary. Their combined ages is 35. How old is Mary?

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Question 171111This question is from textbook
: Mary's sister is 7 years older than mary. Their combined ages is 35. How old is Mary? This question is from textbook

Answer by KnightOwlTutor(293) About Me  (Show Source):
You can put this solution on YOUR website!
Mary's age=x
Mary's sister=x+7
x+x+7=35
Simplify
2x+7=35
Subtract 7 from both sides
2x=28
Divide both sides by 2
x=14
Therefore Mary is 14
Let's doublecheck our answer
14+7=21
21+14=35