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Eve , Your theory would work if we knew that the picture actually weighs 20 lbs., but we don't. It weighs 10 lbs. according to the question. so half of 10 is 5, not 10.
joni s mead, Where does it say that the total weight is 10? It doesn't. You are solving to find the total weight. 20. Half of 20 (its own weight) is 10. Add another 10 to get 20.
Marienne Litolff, It does not say that the total weight is 10. You have to solve for total weight. The total weight is 20. Half of its total weight is 10. 10 + 10 = 20