Solutions by everydaycalculation.com
1630 - 830 is 415.
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Related: 32/30-8/30 16/30-16/30 16/60-8/30 16/30-8/60 48/30-8/30 16/30-24/30 16/90-8/30 16/30-8/90 80/30-8/30 16/30-40/30 16/30-56/30
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