SOLUTION: The difference between the age of Sarah and Anna is 15 .What is the sum of their age if Sarah's age is twice Anna's age. Answer in Algebra Form

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Question 769653: The difference between the age of Sarah and Anna is 15 .What is the sum of their age if Sarah's age is twice Anna's age. Answer in Algebra Form
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
S-A=15
and
S=2A
so 2A-A=15, A=15
therefore S=30