Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 3 4/7
121 - 257 is -7421.
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Related: 2/21-25/7 1/21-50/7 1/42-25/7 1/21-25/14 3/21-25/7 1/21-75/7 1/63-25/7 1/21-25/21 5/21-25/7 1/21-25/35 7/21-25/7 1/21-25/49
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