Question

The angle of a triangle are (x-40) (x-20) and (x+15) find the value of x

Answer 1

Answer:

$(x - 40) + (x - 20) + (x + 15) = 180 \\ 3x - 60 + 15 = 180 \\ \\ 3x = 240 - 15 \\ \\ 3x = 225 \\ \\ x = 75$