Solutions by everydaycalculation.com
1820 - 1520 is 320.
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Related: 36/20-15/20 18/20-30/20 18/40-15/20 18/20-15/40 54/20-15/20 18/20-45/20 18/60-15/20 18/20-15/60 90/20-15/20 18/20-75/20
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