Solutions by everydaycalculation.com
1st number: 1 8/20, 2nd number: 1 5/20
2820 - 2520 is 320.
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Related: 56/20-25/20 28/20-50/20 28/40-25/20 28/20-25/40 84/20-25/20 28/20-75/20 28/60-25/20 28/20-25/60
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