Question 372651
{{{A+B+C=180}}}
.
.
{{{B=A-40}}}
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{{{C=2A}}}
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Substitute,
{{{A+(A-40)+2A=180}}}
{{{4A-40=180}}}
{{{4A=220}}}
{{{highlight(A=55)}}}degrees
.
.
{{{B=55-40}}}
{{{highlight(B=15)}}}degrees
.
.
{{{C=2(55)}}}
{{{highlight(C=110)}}}degrees