Solutions by everydaycalculation.com
1st number: 6 0/10, 2nd number: 4 0/10
6010 - 4010 is 21.
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Related: 60/10-80/10 60/20-40/10 60/10-40/20 60/30-40/10 60/10-40/30 60/50-40/10 60/10-40/50 60/70-40/10 60/10-40/70
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