Solutions by everydaycalculation.com
1618 - 818 is 49.
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Related: 32/18-8/18 16/18-16/18 16/36-8/18 16/18-8/36 48/18-8/18 16/18-24/18 16/54-8/18 16/18-8/54 80/18-8/18 16/18-40/18 16/90-8/18 16/18-8/90 16/18-56/18
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