Question 965277
{{{Y=F/2}}}
.
.
{{{Y-9=(2/5)(F-9)}}}
{{{5(Y-9)=2(F-9)}}}
{{{5Y-45=2F-18}}}
{{{5Y=2F+27}}}
Multiplying by 2
{{{10Y=4F+54}}}
Substituting from above,
{{{5F=4F+54}}}
{{{F=54}}}
So then,
{{{Y=54/2}}}
{{{Y=27}}}
You're 27, your father is 54.