9 years hence a girl will be 3 times as old as she was 9 years ago. Find her age.
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erika77:
let the present age be x. 9 years ago , the girl was= x-9. 9 years hence , the girl will be=x+9. ATQ,3(x-9) = x+9. 3x-27=x+9. 3x-x = 9+27. 2x=36. x=36/2. x=18 ans
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Let the girl age be x
After 9 years her age will be x + 9
Before 9 years her age will be x - 9
x + 9 = 3 ( x - 9 )
x + 9 = 3x - 27
x - 3x = - 27 - 9
- 2x = - 36
x = 18
Girl' s age is 18 years.
After 9 years her age will be x + 9
Before 9 years her age will be x - 9
x + 9 = 3 ( x - 9 )
x + 9 = 3x - 27
x - 3x = - 27 - 9
- 2x = - 36
x = 18
Girl' s age is 18 years.
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18 is the answer
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