SOLUTION: Cheryl is eleven more than three times as old as Brad. In 7 years the sum of their ages will be 81. How old is Cheryl ?

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Question 1124384: Cheryl is eleven more than three times as old as Brad. In 7 years the sum of their ages will be 81. How old is Cheryl ?

Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
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From the condition, you have this system of 2 equations


C = 11 + 3B            (1)

(C+7) + (B+7) = 81.    (2)


Simplify and solve it by substitution.