Solutions by everydaycalculation.com
1st number: 18/30, 2nd number: 1 18/30
1830 - 4830 is -11.
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Related: 36/30-48/30 18/30-96/30 18/60-48/30 18/30-48/60 54/30-48/30 18/90-48/30 18/30-48/90 90/30-48/30
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