There are 454 grams in a pound. There are 16 ounces in a pound.

There are 454/15= 30.266666666... grams in an ounce.

The rounded answer would be 30.27.

Note, there are 16 ounces in a pound, so I'm not sure if you intentionally made it 15

Edit:

In that case, 454/16= 28 3/8 grams in an ounce.

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