SOLUTION: sum of 2 numbers is twice their difference. if one of the numbers is 10, the other number is what?

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Question 350240: sum of 2 numbers is twice their difference. if one of the numbers is 10, the other number is what?
Found 2 solutions by solver91311, ewatrrr:
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!




Solve for .

John

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Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Hi,
.
*Note: Let n be the unknown number
.
Write as You read
10 + n = 2*(n-10)
.
Simplify and solve
10 + n = 2n -20
10+20= n
n = 30
.
check your answer
10+30 = 2*(30-10) = 40