Solutions by everydaycalculation.com
1620 - 1520 is 120.
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Related: 32/20-15/20 16/20-30/20 16/40-15/20 16/20-15/40 48/20-15/20 16/20-45/20 16/60-15/20 16/20-15/60 80/20-15/20 16/20-75/20
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