Solutions by everydaycalculation.com
1st number: 1 15/20, 2nd number: 8/20
3520 + 820 is 4320.
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Related: 70/20+8/20 35/20+16/20 35/40+8/20 35/20+8/40 35/20+24/20 35/60+8/20 35/20+8/60 35/20+40/20 35/20+56/20
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