In the figure AOB is a straight line then the value of \(x\) is
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 40°
AOB is a straight line, so the three angles at O that stand on it are angles on a straight line and add up to 180°.
\((2x-10)+(x+10)+(x+20)=180\)
\(4x+20=180\)
\(4x=160\)
\(x=40^\circ\)