Solutions by everydaycalculation.com
1st number: 2/20, 2nd number: 1 15/20
220 - 3520 is -3320.
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Related: 4/20-35/20 2/20-70/20 2/40-35/20 2/20-35/40 6/20-35/20 2/60-35/20 2/20-35/60 10/20-35/20 14/20-35/20
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