Solutions by everydaycalculation.com
1st number: 1 10/30, 2nd number: 20/30
4030 - 2030 is 23.
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Related: 80/30-20/30 40/30-40/30 40/60-20/30 40/30-20/60 40/30-60/30 40/90-20/30 40/30-20/90
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