SOLUTION: Four years ago Bob was twice as old as his little sister. Five years from now he will six years older than his sister. How old is each now?

Question 793897: Four years ago Bob was twice as old as his little sister. Five years from now he will six years older than his sister. How old is each now?
Answer by sunny1992(35) (Show Source): You can put this solution on YOUR website!
let,
little sister age = X
Bob age= 2X
current age
sister's age = X+4
Bob age = 2X+4
After 5 years
sister age= X+4+5
Bob age = X+4+5+6 (six year older than sister) OR 2x+4+5
so,
X+4+5+6=2x+4+5
X+15=2X+9
X=6
Sister's current age= 6+4= 10
Bob Current age= 12+4=16
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