Solutions by everydaycalculation.com
1st number: 16/30, 2nd number: 1 10/30
1630 - 4030 is -45.
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Related: 32/30-40/30 16/30-80/30 16/60-40/30 16/30-40/60 48/30-40/30 16/90-40/30 16/30-40/90 80/30-40/30
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