When stacking bags of dog food, the heaviest items should be placed at the bottom. Starting at the bottom, in what order should bags of dog food weighing 25 pounds, 20 pounds, 30 pounds, and 28 pounds be stacked?

30 pounds is heaviest.

30, 28, 25, 20 lbs.

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30 pounds

To stack the bags of dog food in the correct order based on their weights, we need to arrange them from heaviest to lightest. In this case, the weights are 25 pounds, 20 pounds, 30 pounds, and 28 pounds.

One way to determine the correct order is to compare the weights two at a time. Let's go through the process:

1. Compare the 25-pound bag with the 20-pound bag. Since 25 is greater than 20, the 25-pound bag should be placed below the 20-pound bag.

2. Now, compare the 25-pound bag (which is already placed) with the 30-pound bag. Since 30 is greater than 25, the 30-pound bag should be placed below the 25-pound bag and above the 20-pound bag.

3. Lastly, compare the 30-pound bag (which is already placed) with the 28-pound bag. Since 30 is greater than 28, the 30-pound bag should remain on top, followed by the 28-pound bag. The 25-pound bag is still at the bottom, and the 20-pound bag is in the middle.

So, the correct order from the bottom up is: 25 pounds, 20 pounds, 30 pounds, and 28 pounds.