Solutions by everydaycalculation.com
1420 - 1020 is 15.
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Related: 28/20-10/20 14/40-10/20 14/20-10/40 42/20-10/20 14/20-30/20 14/60-10/20 14/20-10/60 70/20-10/20 14/20-50/20 98/20-10/20 14/20-70/20
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