Solutions by everydaycalculation.com
2124 - 1824 is 18.
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Related: 42/24-18/24 21/24-36/24 21/48-18/24 21/24-18/48 63/24-18/24 21/24-54/24 21/72-18/24 21/24-18/72 21/24-90/24
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