Kevin's present age is 39 years
Daniel's present age is 3 years
Let's assume x be the required number of years
So, after x years
Kevin's age = 39+x
Daniel's age = 3+x
After x years it take until Kevin is only 4 times as old as Daniel
so,
we get
[tex]39+x=4\times (3+x)[/tex]
now, we can solve for x
[tex]39+x=12+4x[/tex]
Subtract both sides by 12
[tex]39+x-12=12+4x-12[/tex]
[tex]27+x=4x[/tex]
Subtract both sides by x
[tex]27+x-x=4x-x[/tex]
[tex]27=3x[/tex]
Divide both sides by 3
[tex]9=x[/tex]
So, it will take 9 years...........Answer
