Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/60 of 6/7?"
2160 × 67 is 310.
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Related: 42/60×6/7 21/60×12/7 21/60×6/14 63/60×6/7 21/60×18/7 21/60×6/21 21/60×30/7 21/60×6/35 21/60×42/7 21/60×6/49
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