1. **State the problem:** Subtract 17 lb 2 oz from 20 lb 15 oz. 2. **Understand the units:** 1 pound (lb) = 16 ounces (oz). 3. **Convert to ounces for easier subtraction:** - Convert 20 lb 15 oz to ounces: $$20 \times 16 + 15 = 320 + 15 = 335\, \text{oz}$$ - Convert 17 lb 2 oz to ounces: $$17 \times 16 + 2 = 272 + 2 = 274\, \text{oz}$$ 4. **Subtract the ounces:** $$335 - 274 = 61\, \text{oz}$$ 5. **Convert back to pounds and ounces:** - Divide 61 by 16 to find pounds: $$\frac{61}{16} = 3\, \text{lb} \text{ remainder } 13\, \text{oz}$$ - Show cancellation step: $$\frac{61}{\cancel{16}} = 3\, \text{lb} \text{ remainder } 13\, \text{oz}$$ 6. **Final answer:** $$3\, \text{lb} \, 13\, \text{oz}$$ Therefore, the answer is **3 lb 13 oz**.