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