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Two lines cross at O. The marked angles are $(2 x + 10)$ ° and $(3 x - 20)$ °. What is the size of each of these angles?

Class 7Adjacent and Vertically Opposite AnglesLines and Angles

A30°
B110°
C70°
D35°

Step-by-Step Solution

They are vertically opposite, so

2 x + 10 = 3 x - 20

, giving

x = 30

. Each angle is

2 (30) + 10 = 7 0^{\circ}

.

Answer: C) 70°

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