Hello Htownrealest
We know that on Friday it snowed 10 inches
And on Saturday is snowed 12.3
So our problem here is how much more snow fell on Friday and Saturday than on Sunday.
So we would have to add Friday and Saturday's inches of snow together
10 + 12.3 = 22.3
Then subtract how much it snowed on Sunday
22.3 - 5.125 = 17.175
It snowed 17.175 cinches on Friday and Saturday than it did on Sunday.
:)