SOLUTION: Mark's father is 55. This is 15 years older than twice Mark's age. How old is Mark?

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Question 1026736: Mark's father is 55. This is 15 years older than twice Mark's age. How old is Mark?
Answer by ikleyn(52805) About Me  (Show Source):
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Mark's father is 55. This is 15 years older than twice Mark's age. How old is Mark?
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%2855-15%29%2F2 = 20.