SOLUTION: Jack is 3 years younger than twice Mary's age . If the sum of their ages is 90 , how old is Mary ?

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Question 1174293: Jack is 3 years younger than twice Mary's age . If the sum of their ages is 90 , how old is Mary ?
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi
Jack is 3 years younger than twice Mary's age 'x'
  x + (2x-3) = 90  ⇒  3x = 93  and x = 31, Mary's Age

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