Question 1009724: 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.
Found 2 solutions by ikleyn, MathTherapy:
Answer by ikleyn(52803)   (Show Source):
You can put this solution on YOUR website! .
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 =  = 6.
Answer. In 6 years.
Answer by MathTherapy(10552)  (Show Source):
You can put this solution on YOUR website!
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.
Value of x: 
Thus, in 6 years' time, father will be 3 times as old as son will be, then.
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