Solutions by everydaycalculation.com
818 - 518 is 16.
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Related: 16/18-5/18 8/18-10/18 8/36-5/18 8/18-5/36 24/18-5/18 8/18-15/18 8/54-5/18 8/18-5/54 40/18-5/18 8/18-25/18 8/90-5/18 8/18-5/90 56/18-5/18 8/18-35/18
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