SOLUTION: Lisa is 3 years younger than Carrie. The sum of Lisa and Carrie's ages is 87. How old is Lisa?

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Question 1173523: Lisa is 3 years younger than Carrie. The sum of Lisa and Carrie's ages is 87. How old is Lisa?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Lisa is Carrie-3, or Carrie is Lisa+3. Second alternative is easier for the question, "how old is Lisa?"

Carrie, L+3
Lisa, L
%28L%2B3%29%2BL=87
.
.