Question 1009724
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A boy is 12 years old. His father is four times as old. In x years' time, the father will be three times as old as the son. Calculate the value of x.
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According to the first part of the condition, the father is 48 years now.


The second part of the condition gives an equation


3*(x + 12) = x + 48.


Simplify and solve it:


3x + 36 = x + 48,


2x = 48 - 36 = 12,


x = {{{12/2}}} = 6.


<U>Answer</U>. In 6 years.