Solutions by everydaycalculation.com
1st number: 1 10/20, 2nd number: 2 0/20
3020 - 4020 is -12.
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Related: 60/20-40/20 30/20-80/20 30/40-40/20 90/20-40/20 30/60-40/20 30/20-40/60
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