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Well, we know that a common denominator of 1/5 and 2/7 is there denominators multiplied together, that is, 5x7 = 35.

So, let's see . . . ummm . . . 1/5 is the same as 7/35 (I divided "5" into "35") and similarly, 2/7 = 10/35.

Then you add them together 7/35 + 10/35 = 17/35ths. This fraction cannot be reduced further.

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Q: What is 1 fifth plus 2 sevenths?
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