Solutions by everydaycalculation.com
2430 - 1830 is 15.
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Related: 48/30-18/30 24/30-36/30 24/60-18/30 24/30-18/60 72/30-18/30 24/30-54/30 24/90-18/30 24/30-18/90 24/30-90/30
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