Solutions by everydaycalculation.com
1st number: 3 10/20, 2nd number: 1 10/20
7020 - 3020 is 21.
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Related: 70/20-60/20 70/40-30/20 70/20-30/40 70/20-90/20 70/60-30/20 70/20-30/60
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