For this case we have the following conversion: 1 pound = 16 ounces Then we rewrite the sack weights: 14 pounds 9 ounces = 14 9/16 9 pounds 14 ounces = 9 14/16 = 9 7/8 Then, we subtract both values: (14 9/16) - (9 7/8) = 4.6875 = 4 + 0.6875 Rewriting: 4 + 0.6875 = 4 + 6875/1000 4 + 1375/200 = 4 + 275/40 4 + 275/40 = 4 + 55/8 Answer: the weight of the potatoes wendy use for the potato salad is: 4 + 55/8 pounds