That equals 550.
100+80, 99+81, 98+82....
To solve this one, subtract 50 from 180 and you'll have your answer.
It is: 126 plus 54 = 180
=83+2
83
a + 3a + 5a = 180 9a =180 a = 20
-83 + 24 +(-19)= -102+ 24= -78
It is: 157+23 = 180
It is 90+90 = 180
It is 134+46 = 180
180+72=252