Question 1193345
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Informally....<br>
Since the sum of their ages 3 years from now will be 72, the sum of their ages now is 66.<br>
We need to divide those 66 years into two parts in the ratio 5:1; their ages are 55 and 11.<br>
Formally....<br>
x = son's age now
5x = father's age now
x+3 = son's age 3 years from now
5x+3 = father's age 3 years from now<br>
The sum of their ages 3 years from now will be 72:<br>
{{{(x+3)+(5x+3)=72}}}
{{{6x+6=72}}}
{{{6x=66}}}
{{{x=11}}}<br>
ANSWER: The son's age now is x=11; the father's age now is 5x=55.<br>