Solutions by everydaycalculation.com
1st number: 1 15/20, 2nd number: 1 6/10
3520 - 1610 is 320.
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Related: 70/20-16/10 35/20-32/10 35/40-16/10 35/20-16/20 35/20-48/10 35/60-16/10 35/20-16/30 35/20-80/10 35/20-16/50 35/20-16/70
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