A + m = 54, m = a + 4 and, a + m = 54, - a + m = 4,
Combine the equations: 2m = 58
Now solve: 2m = 58, 2m/2 = 58/2, m = 29, therefore a = 24
Have you been taught the butterfly technique
You'd have to get 112 out of 140 in order to get an 80% right on the dot