Solutions by everydaycalculation.com
1st number: 1 10/20, 2nd number: 1 5/10
3020 - 1510 is 01.
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Related: 60/20-15/10 30/20-30/10 30/40-15/10 30/20-15/20 90/20-15/10 30/20-45/10 30/60-15/10 30/20-15/30 30/20-75/10 30/20-15/50 30/20-15/70
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