Question 876099
You could say the son's age now   = {{{ s }}}
2 yrs ago, the son's age was {{{ s - 2 }}}
The father's age 2 yrs ago was {{{ 4*( s - 2 ) }}}
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So, now, 2 yrs later, the father's age is {{{ 4*( s - 2 ) + 2 }}}
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In 3 yrs, the son will be {{{ s + 3 }}}
In 3 yrs, the father will be {{{ 4*( s - 2 ) + 2 + 3 }}}
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You are given that:
{{{ 4*( s - 2 ) + 2 + 3 = 3*( s + 3 ) }}}
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Solve for {{{ s }}}
{{{ 4s - 8 + 5 = 3s + 9 }}}
{{{ s = 12 }}}
and, the father's age now is:
{{{ 4*( s - 2 ) + 2 }}}
{{{ 4*( 12 - 2 ) + 2 = 42 }}}
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The father is 42 and the son is 12
check:
2 yrs ago,
f = 40
s = 10
Father's age is 4 times the son's
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In 3 yrs:
f = 45
s = 15 
Father's age is 3 times the son's
OK