Question 1054150
1.{{{T+F+X=48}}}
2.{{{T=2F}}}
3.{{{6T+3F+X=168}}}
Substituting into eq. 1 and 3,
{{{2F+F+X=48}}}
4.{{{3F+X=48}}}
.
.
{{{6(2F)+3F+X=168}}}
{{{12F+3F+X=168}}}
5.{{{15F+X=168}}}
Subtracting eq. 4 from eq. 5,
{{{15F+X-3F-X=168-48}}}
{{{12F=120}}}
{{{F=10}}}
So then,
{{{T=2(10)}}}
{{{T=20}}}
and
{{{3(10)+X=48}}}
{{{30+X=48}}}
{{{X=18}}}