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120 - 76 = w+w. So: 2w = 44. So: w=22.
There are 18 Green balls and 12 Blue balls. You have to pick 2 blue balls, so the green balls don't matter. You can pick 1 blue ball on 12 ways. The second ball you can pick on 11 ways (because there are 11 balls left). 12 * 11 = 132. So you can pick it on 132 ways. ;)
If 1 + w = 12, then w = 12 - 1, so w = 11
if w - - 5 = 4, then w+4 = 4, subtract 4 from both sides = w = 4 - 4, so w = 0 and now the correct answer if w - - 5 = 4, then w+5 = 4, subtract 5 from both sides gives w = 4 - 5, so w = -1
So that they roll smoothly. Notice that the balls for American football are not spheres, they bounce unpredictably when they hit theground.