SOLUTION: susan is 3 years older then her sister.their combined age is 33 years.how old is susan?

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Question 675617: susan is 3 years older then her sister.their combined age is 33 years.how old is susan?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let her sister's age = +x+
+x+%2B+3+ = Susan's age
given:
+x+%2B+x+%2B+3+=+33+
+2x+%2B+3+=+33+
+2x+=+30+
+x+=+15+
and
+x+%2B+3+=+18+
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Susan's age is 18
Her Sister's age is 15