Solutions by everydaycalculation.com
510 - 15 is 310.
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Related: 5/10-2/5 5/20-1/5 5/10-1/10 15/10-1/5 5/10-3/5 5/30-1/5 5/10-1/15 25/10-1/5 5/50-1/5 5/10-1/25 35/10-1/5 5/10-7/5 5/70-1/5 5/10-1/35
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