Solutions by everydaycalculation.com
830 - 330 is 16.
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Related: 16/30-3/30 8/30-6/30 8/60-3/30 8/30-3/60 24/30-3/30 8/30-9/30 8/90-3/30 8/30-3/90 40/30-3/30 8/30-15/30 56/30-3/30 8/30-21/30
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