Question 426356
.
A father is nine times the age of his son. In 5 years he will be four times the age of his son. 
How old are they now?
~~~~~~~~~~~~~~~~~~~~~~~~~~~



        The answer in the post by @mananth is incorrect.

        I came to bring a correct solution (including the answer).



<pre>
Son's age x

Father's age 9x

    5 years later

Son's age x +5

Father's age 9x+5


In 5 years, the father's age is four times the son age

   9x + 5 = 4(x+5)
   9x + 5 = 4x + 20
   5x = 20-5
   5x = 15
   /5

   x  =  3 years Son's age
   9x = 27 years Father's age
</pre>

Solved correctly.