Solutions by everydaycalculation.com
1642 - 1042 is 17.
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Related: 32/42-10/42 16/42-20/42 16/84-10/42 16/42-10/84 48/42-10/42 16/42-30/42 80/42-10/42 16/42-50/42 16/42-70/42
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