Solutions by everydaycalculation.com
1st number: 4 10/20, 2nd number: 1 10/20
9020 - 3020 is 31.
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Related: 90/20-60/20 90/40-30/20 90/20-30/40 90/20-90/20 90/60-30/20 90/20-30/60
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