Solutions by everydaycalculation.com
945 - 645 is 115.
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Related: 18/45-6/45 9/45-12/45 9/90-6/45 9/45-6/90 27/45-6/45 9/45-18/45 9/45-30/45 63/45-6/45 9/45-42/45
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