Two angles on a straight line are 3x and 6x. Find the value of x.
A60°
B20°CORRECT
C30°
D18°
Common EntranceMathematicsAngles
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Why the answer is B, and why the others tempt you.
Angles on a straight line add up to 180°: 3x + 6x = 9x = 180°, so x = 20°.
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