Solutions by everydaycalculation.com
1st number: 2 2/20, 2nd number: 1 15/20
4220 - 3520 is 720.
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Related: 84/20-35/20 42/20-70/20 42/40-35/20 42/20-35/40 42/60-35/20 42/20-35/60
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