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To add fractions, we need to find a common denominator.
The common denominator for 7 and 5 is 35, so we will convert the fractions to have a denominator of 35.
For 3/7: Multiply the numerator and denominator by 5 to get 15/35.
For 1/5: Multiply the numerator and denominator by 7 to get 7/35.
Now we can add the fractions: 15/35 + 7/35 = 22/35.
So, the sum of 3/7 and 1/5 is 22/35.
The other fractions you mentioned are not part of the initial question.