28 plus 17 plus 25 plus 54 plus 20 plus 36 is equal to 180.
To solve this one, subtract 50 from 180 and you'll have your answer.
100+80, 99+81, 98+82....
a + 3a + 5a = 180 9a =180 a = 20
180+72=252
It is: 97+83 = 180
It is: 157+23 = 180
It is 90+90 = 180
It is 134+46 = 180
54 + 560 + 90 = 704
180
120 + 60 = 180