Question

The sum of two angles of a triangle is 80° and their difference is 20° find all the angles

Answer 1

 let the two angles be x and y 

x+y = 80

x-y= 20

adding the two equations above we get 2x = 100 this means x= 50 and y = 30 ... so the third angle will be 180 - (80) = 100

therefore the three angles are 50 30 and 100