Solutions by everydaycalculation.com
1st number: 1 10/20, 2nd number: 10/20
3020 - 1020 is 11.
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Related: 60/20-10/20 30/40-10/20 30/20-10/40 90/20-10/20 30/20-30/20 30/60-10/20 30/20-10/60 30/20-50/20 30/20-70/20
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