Solutions by everydaycalculation.com
1st number: 1 15/20, 2nd number: 1 4/10
3520 - 1410 is 720.
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Related: 70/20-14/10 35/20-28/10 35/40-14/10 35/20-14/20 35/20-42/10 35/60-14/10 35/20-14/30 35/20-70/10 35/20-14/50 35/20-98/10 35/20-14/70
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