Question

The angles of triangle are x,y and40°.The difference between two angles xand y is 30°.find x and y

Answer 1

let40° be z
therefore x+y+z= 180°
or x+y=140. 1
but x-y=30
therefore x=30+y. 2
therefore in 1
30+y+y=140
therefore 2y=140-30=110
therefore y=55
but x=y+30. from 2
therefore x= 55+30=85

answer x=85 y=55