Question

The angles of a triangle are 3xdegree, 2x+20degrees and 5x-40degrees

Answer 1

the sum of all angles of a triangle is 180

3x+2x+20+5x-40=180

10x-20=180

10x=180+20

x=200/10

x=20

now

3x=60

2x+20=60

5x-40=60

the triangle is an equilateral triangle