The new weight of the bag is 72.5kg
After moving all the terms to the right of the equation and solving you would get A = -36/49. Hope this helps!
40% means 0.4 .
So . . . . . 7 = 0.4 N .
Divide each side by 0.4 . . . N = 7/0.4 = 17.5
24/4: 24-12: 12+0: 12/1: 48/4: 72/6: