Solutions by everydaycalculation.com
1620 - 1020 is 310.
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Related: 32/20-10/20 16/40-10/20 16/20-10/40 48/20-10/20 16/20-30/20 16/60-10/20 16/20-10/60 80/20-10/20 16/20-50/20 16/20-70/20
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