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Four sevenths of twenty-eight can be calculated by multiplying 28 by the fraction 4/7. This gives you ( 28 \times \frac{4}{7} = 16 ). Therefore, four sevenths of twenty-eight is 16.
6 sevenths multiplied by 5 eights equals 15 over twenty-eight, or 15/28
38 over 21 or thirty-eight twenty-firsts
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twenty eghiths