Question 983225


as you can see, {{{5y}}}° is an external angle of triangle {{{ABC}}}

we know that {{{5y=180-x}}}°

since angle {{{B}}} is {{{40}}}°, and  angle {{{A=x}}} and {{{C=x}}}, we have

{{{x+x+40=180}}}°

{{{2x=180-40}}}°

{{{x=140/2}}}°

{{{x=70}}}°

so, angle {{{A=70}}}° and {{{C=70}}}°


then

{{{5y=180-70}}}°

{{{5y=110}}}°

{{{y=110/5}}}°

{{{y=22}}}°

so, your answer is: a. {{{22}}}