SOLUTION: Randy is twice as old as his sister Jane. Together the sum of their ages is 15. how old is randy?

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Question 739438: Randy is twice as old as his sister Jane. Together the sum of their ages is 15. how old is randy?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
r=2j
r+j=15
2j+j=15
3j=15
j=5
r=10