57/8 = 399/56
17/7 = 136/56
399 + 136 = 535/56 = 9 and 31/56
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Expressed as a mixed number in its simplest form, 3/7 + 6/7 = 1 2/7 or one and two sevenths.
2 1/4
42/8, or 5 and 1 fourth
Two divided by 1 6/7 is 1.07692307692
1/4