Question

Find the value ox X:
A 20
B 18
C 15
D 11

Answer 1

x =15°

Explanation:

Given that the horizontal line is 90° to the vertical line, then both the angles have to necessarily add up to 90° i.e

(5x-10)° + 25° = 90°

5x - 10 + 25 = 90

5x + 15 = 90 (subtract 15 from both sides)

5x = 90 - 15

5x = 75 (divide both sides by 5)

x = 75 / 5 = 15°

Answer 2

25+5x-10=90
5x+15=90
5x=75
x=15

The answer would be C, 15.