Question 946210
1.{{{A+B=27}}}
2.{{{A+C=23}}}
3.{{{B+C=18}}}
From eq. 3,
{{{C=18-B}}}
Substitute into eq. 2,
{{{A+18-B=23}}}
3.{{{A-B=5}}}
Now add eq. 1 and 3,
{{{A+B+A-B=27+5}}}
{{{2A=32}}}
{{{A=16}}}
Then,
{{{16-B=5}}}
{{{B=11}}}
and finally,
{{{16+C=23}}}
{{{C=7}}}