SOLUTION: John is 13 years old. He is 3 years older than twice his sister Mary's age. How old is john?

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Question 462753: John is 13 years old. He is 3 years older than twice his sister Mary's age. How old is john?
Answer by algebrahouse.com(1659) About Me  (Show Source):
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"John is 13 years old. He is 3 years older than twice his sister Mary's age. How old is john?"

John is 13.....it's in the first sentence.

x = Mary's age
2x + 3 = John's age

2x + 3 = 13 {John's age is 13, he is 3 yrs older than twice Mary's age}
2x = 10 {subtracted 3 from both sides}
x = 5 {divided both sides by 2}

John is 13 and Mary is 5
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