In order to solve this you need to first add the number of envelopes together to get the sum of how many envelopes there are, 1 + 3 + 2 + 2 = 8. Next you add the amount of blue and green envelopes together3 + 2 = 5. The total number of envelopes is8, and 5out of the 8are green or blue, therefore you will have a 8out of 5 chance of picking one of those colors.
