Question 342985
For a triangle,
{{{A+B+C=180}}}
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{{{A=B/2}}}
{{{B=2A}}}
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{{{C=40+4A}}}
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Substitute into the first equation,
{{{A+2A+40+4A=180}}}
{{{7A+40=180}}}
{{{7A+140}}}
{{{highlight( A=20)}}}degrees
Then
{{{B=2(20)}}}
{{{highlight( B=40)}}}degrees
.
.
{{{C=40+4(20)}}}
{{{highlight( C=120)}}}degrees