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?
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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