Question 1029178
{{{S/F=3/10}}}
{{{10S=3F}}}
and
{{{F=56+S}}}
{{{3F=168+3S}}}
Substituting,
{{{10S=168+3S}}}
{{{7S=168}}}
{{{S=24}}}
{{{F=56+24}}}
{{{F=80}}}