Solutions by everydaycalculation.com
1st number: 1 2/10, 2nd number: 9/12
1210 + 912 is 3920.
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Related: 24/10+9/12 12/10+18/12 12/20+9/12 12/10+9/24 36/10+9/12 12/10+27/12 12/30+9/12 12/10+9/36 60/10+9/12 12/10+45/12 12/50+9/12 12/10+9/60 84/10+9/12 12/10+63/12 12/70+9/12 12/10+9/84
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