Solutions by everydaycalculation.com
1st number: 16/20, 2nd number: 1 15/20
1620 - 3520 is -1920.
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Related: 32/20-35/20 16/20-70/20 16/40-35/20 16/20-35/40 48/20-35/20 16/60-35/20 16/20-35/60 80/20-35/20
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