The ratio of blue disks to yellow disks to green disks in this bag is 3 : 7 : 8, which means that for every 3 blue disks, we have 7 yellow disks, and 8 green disks. Since this is a ratio, we can let the number of blue disks in the bag be 3x, the number of yellow disks be 7x, and the number of green disks be 8x. So 3x + 7x + 8x = 90. If we simplify the equation we get 18x = 90. We can then divide both sides by 18. So . In order to solve for the number of disks, replace x with 5. Therefore the number of green disks is 8x = 8(5) = 40 and the number of blue disks is 3x = 3(5) = 15. The number of green disks is greater than the number of blue disks by 40 - 15 = 25.
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