Solutions by everydaycalculation.com
1642 - 1242 is 221.
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Related: 32/42-12/42 16/42-24/42 16/84-12/42 16/42-12/84 48/42-12/42 16/42-36/42 80/42-12/42 16/42-60/42 16/42-84/42
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