15 (x = 135)
15
x-y = 120 x+y = 150 add equations: 2x = 270 x = 135 y = 15
-90
It's an inconsistent pair of equations, for which there is no solution.
10 plus 20 plus 30plus 40 plus 50 equals 150 because 50 plus 40 equals 90 plus 30 =120+20= 140 then + 10 = 150
X = 135 and y = 15 Solved by addition and substitution
120 + 30 = 150
150
13% of 150 is 19.5 so 150 plus 19.5 equals 169.5
80%.... take 120 and divide it by 150 you get 0.8 move your decimal two places to the right and you get 80%
150 + 200 + 100 + 130 = 580
501