Solutions by everydaycalculation.com
1st number: 1 15/20, 2nd number: 1 5/20
3520 - 2520 is 12.
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Related: 70/20-25/20 35/20-50/20 35/40-25/20 35/20-25/40 35/20-75/20 35/60-25/20 35/20-25/60
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