Solutions by everydaycalculation.com
1st number: 1 14/21, 2nd number: 6/7
3521 - 67 is 1721.
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Related: 70/21-6/7 35/21-12/7 35/42-6/7 35/21-6/14 35/21-18/7 35/63-6/7 35/21-6/21 35/21-30/7 35/21-6/35 35/21-42/7 35/21-6/49
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