Well it has to be either 23 or 9 because you have to add the two smallest sides also you have to subtract them . What are the options ?
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I don't know what you mean by this but you'll just get a value larger than the two sums that you added
5 + 7 = 12
3 + 4 = 7
7. is 4 yards and 2 feet
8.176
9. 13 cups is greater
10. 25 lbs is greater
11. 13 quarts