Question 828423
2/3 of right angle is 2/3 of 90 or 60
The remaining two angles total 120 since the sum of the 3 needs to be 180
Set x = one angle
set (x+18) = the other angle
x + (x+18) = 120
2x + 18 = 120
subtract 18 from each side
 2x = 102
 x = 51
 (x+18) = 51+18 = 69
So the angles are 60 51 and 69 .