Question 242629
Let son = x
Let dad = 5+4x
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In five years dad will be three times his son's age then.  So, our equation becomes:
{{{(5+4x)+5=3(x+5)}}}
Now let's solve for x to determine the son's age.
{{{4x+10=3x+15}}}
{{{4x-3x=15-10}}}
{{{x=5}}} <--- the son's age is 5 years old.
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{{{5+4x=5+(4*5)=5+20=25}}} <--- dad is 25 years old.
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Check:
{{{(5+4x)+5=3(x+5)}}}
{{{(5+(4*5))+5=3(5+5)}}}
{{{5+20+5=3*10}}}
{{{30=30}}}
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Done!  ...  Happy Thanksgiving Day !!