SOLUTION: Ray is 3 times as old as his brother how old is he if in 7 years he will be double his brother's age?

Question 903242: Ray is 3 times as old as his brother how old is he if in 7 years he will be double his brother's age?
Found 2 solutions by lwsshak3, josmiceli:
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
Ray is 3 times as old as his brother how old is he if in 7 years he will be double his brother's age?
***
let x=brother's age
3x=Ray's age
..
In 7 yrs:
x+7=brother's age
3x+7=Ray's age
3x+7=2(x+7)
3x+7=2x+14
x=7
3x=21
Ray's age=21
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = Ray's age now
Let = his brother's age now
---------------
(1)
(2)
-------------------------
(2)
(2)
Substitute (1) into (2)
(2)
(2)
and
(1)
(1)
(1)
----------------
Ray is 21
His brother is 7
----------------
check:
(2)
(2)
(2)
(2)
OK
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