Question

The angles of a triangle are 3x°, (2x+20)° and (5x-40)° find the angles

Answer 1

3x+2x+20+5x-40=180
10x=200
x=20
therefore angles are 3x=60°,2x+20=40+20=60°and 5x-40=100-40=60°

Answer 2

3x + 2x + 20 + 5x - 40 = 180°

(Angle Sum Property of a Triangle)

10x - 20 = 180

10x = 200

x = 20°

Therefore the angles are

3x = 3 × 20 = 60°

2x + 20 = 60°

5x-40 = 60°

Hence it is an equilateral triangle.

Hope it helps!!