SOLUTION: The sum of two numbers is 30 and their difference is 10. What are the two numbers?

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Question 300032: The sum of two numbers is 30 and their difference is 10. What are the two numbers?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
X+Y=30
X-Y=10 ADD
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2X=40
X=40/2
X=20 ANS.
20+Y=30
Y=30-20
Y=10 ANS.
PROOF:
20-10=10
10=10