Question

Enter the number that belongs in
the green box.
2x + 42 x 4x
x = [ ? ]

Answer 1

For the given equation, x = 21.

Explanation:

Here, the lines represent the set of two intersecting lines.

And, the given angles (2x +42) and (4x) are VERTICALLY OPPOSITE ANGLES.

So, (2 x +42) = (4 x)

⇒ 42 = 4 x - 2 x

or, 2 x = 42

⇒ x = 42 /2 = 21

⇒ x = 21

Hence, for the given equation, x = 21.