The diagram shows that 2x and x- 48 both lie on a straight line.
Therefore,
[tex]\begin{gathered} 2x+(x-48)=180\text{ (angles on a straight line sum up to 180)} \\ 2x+x-48=180 \\ \text{Collect all like terms;} \\ 3x=180+48 \\ 3x=228 \\ \text{Divide both sides by 3} \\ \frac{3x}{3}=\frac{228}{3} \\ x=76 \end{gathered}[/tex]The correct answer is option B, that is 76
