Solutions by everydaycalculation.com
1524 - 1224 is 18.
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Related: 30/24-12/24 15/48-12/24 15/24-12/48 45/24-12/24 15/24-36/24 15/72-12/24 15/24-12/72 75/24-12/24 15/24-60/24 15/24-84/24
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