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The idea here is that, to be able to subtract the ounces, you "borrow" from the pounds. In other words, in 13 lb 7 oz, you take away one pound, and add the equivalent (16 ounces) to the 7 ounces. After doing this change, you can easily subtract.
"Julia, may I borrow your eraser?"
No.
pound is labeled lb., not pound
no