Solutions by everydaycalculation.com
1st number: 24/30, 2nd number: 1 15/30
2430 - 4530 is -710.
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Related: 48/30-45/30 24/30-90/30 24/60-45/30 24/30-45/60 72/30-45/30 24/90-45/30 24/30-45/90
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