Final answer:
The common denominator for 6/7 and 3/5 is 35.
Step-by-step explanation:
To find a common denominator for fractions, we need to find a number that is divisible by both denominators. In this case, the denominators are 7 and 5. To find the least common multiple of 7 and 5, we can list the multiples of each number and find the smallest number that appears in both lists. Multiples of 7: 7, 14, 21, 28, 35, ... Multiples of 5: 5, 10, 15, 20, 25, 30, ... The smallest number that appears in both lists is 35. Therefore, the common denominator for 6/7 and 3/5 is 35.