18/7...not
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Three and five-sevenths is the same as 26/7, so the reciprocal is 7/26.
To divide by a fraction, multiply by its reciprocal. In this instance, 3/7 / 4/7 = 3/7 x 7/4 = 21/28 = 3/4. Therefore, three sevenths divided by four sevenths is equal to three quarters.
2 and four sevenths 5 & 2/7 minus 2 & 5/7 equals 2 & 4/7
2 and 5/7 (i think)