Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 1/5 of 5/7?"
15 × 57 is 17.
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Related: 2/5×5/7 1/5×10/7 1/10×5/7 1/5×5/14 3/5×5/7 1/5×15/7 1/15×5/7 1/5×5/21 1/5×25/7 1/25×5/7 1/5×5/35 7/5×5/7 1/5×35/7 1/35×5/7 1/5×5/49
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