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The simplest form for nine twenty sevenths is 3/10.
One fourth times three sevenths is calculated by multiplying the numerators and denominators: ( \frac{1}{4} \times \frac{3}{7} = \frac{1 \times 3}{4 \times 7} = \frac{3}{28} ). Therefore, one fourth times three sevenths equals three twenty-eighths.
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