To find out how many ounces are not peroxide in a 16-ounce bottle that is 70% peroxide, we can first determine how much peroxide is in the bottle and then subtract that from the total volume.
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Calculate the amount of peroxide: \[ \text{Amount of peroxide} = 70% \text{ of } 16 \text{ ounces} = 0.70 \times 16 = 11.2 \text{ ounces} \]
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Now, calculate the amount that is not peroxide: \[ \text{Amount not peroxide} = \text{Total volume} - \text{Amount of peroxide} = 16 - 11.2 = 4.8 \text{ ounces} \]
Therefore, the amount that is not peroxide is 4.8 ounces.