Solutions by everydaycalculation.com
13 + 67 is 2521.
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Related: 2/3+6/7 1/3+12/7 1/6+6/7 1/3+6/14 1/3+18/7 1/9+6/7 1/3+6/21 5/3+6/7 1/3+30/7 1/15+6/7 1/3+6/35 7/3+6/7 1/3+42/7 1/21+6/7 1/3+6/49
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