Solutions by everydaycalculation.com
1530 - 1030 is 16.
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Related: 15/30-20/30 15/60-10/30 15/30-10/60 45/30-10/30 15/90-10/30 15/30-10/90 75/30-10/30 15/30-50/30 15/30-70/30
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