Solutions by everydaycalculation.com
1620 - 820 is 25.
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Related: 32/20-8/20 16/20-16/20 16/40-8/20 16/20-8/40 48/20-8/20 16/20-24/20 16/60-8/20 16/20-8/60 80/20-8/20 16/20-40/20 16/20-56/20
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