Question 625248
Let x = number of years that pass from now


So in x = 1 year, you will be 40+x = 40+1 = 41 years old and she will be 9+x = 9+1 = 10 years old


So in general, after x years pass, you will be 40+x years old and she will be 9+x years old.



You want to know how long it will take for you to be 3 times as old as her in x years.



So this means that 


(Your age in x years) = 3*(Her age in x years)


40+x = 3*(9+x)


So the equation is 40+x = 3*(9+x)


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Now let's solve 40+x = 3*(9+x)



40+x = 3*(9+x)


40+x = 27+3x


x = 27+3x-40


x-3x = 27-40


-2x = -13


x = -13/(-2)


x = 13/2


x = 6.5


Since this result is not a whole number, this means that you'll never be 3 times as old as her. 

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