Solutions by everydaycalculation.com
1640 - 1240 is 110.
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Related: 32/40-12/40 16/40-24/40 16/80-12/40 16/40-12/80 48/40-12/40 16/40-36/40 80/40-12/40 16/40-60/40 16/40-84/40
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