Question 889726
The sum of Richard's age and Ruel's age is 60. Nine years ago, Richard was twice as old as Ruel then. How old is ruel?
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let x=Richard's age
60-x=Ruel's age
..
9 yrs ago:
x-9=Richard's age
60-x-9=51-x=Ruel's age
x-9=2(51-x)
x-9=102-2x
3x=111
x=37
60-x=23
How old is ruel? 23