If 256 enveloped letters were sent by truck, and 141 were sent by plane, how many more letters were sent by truck than plane? Readers answer this and other postal-related math problems.
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Seller: World of Books (was SecondSale), Montgomery, IL, U.S.A.
Condition: Good. Item in good condition. Textbooks may not include supplemental items i.e. CDs, access codes etc. Seller Inventory # 00070078007