Explanation:

- First, examine the original set (50, 10, 15). Divide the first number (50) by the second number (10) to get 5. Then, add this result (5) to the second number (10). Hence, 5 + 10 equals 15, which matches the third number.

- For the set (60, 10, 16), divide 60 by 10 to get 6, and add this to 10 to get 16, which matches the third number.

- Now, apply the same relationship to the options:

- Option 1: (80, 20, 16)

- 80 divided by 20 equals 4. 4 added to 20 is 24, not 16.

- Option 2: (60, 10, 6)

- 60 divided by 10 equals 6. 6 added to 10 is 16, not 6.

- Option 3: (60, 15, 19)

- 60 divided by 15 equals 4. 4 added to 15 is 19.

- Option 4: (80, 6, 15)

- 80 divided by 6 is approximately 13.3, and adding this to 6 gives more than 19.

Therefore, Option 3: (60, 15, 19) follows the same operation as the original set.