Explanation:

- Two numbers are given in a ratio of 5:7.

- The first number is specified as 20.

- To find the second number, set up the equation based on the ratio:

- If the first number is 5x, then the first number 20 represents 5x = 20.

- Solving for x gives x = 20/5 = 4.

- The second number, according to the ratio 5:7, is 7x.

- Substituting x gives 7 * 4 = 28 for the second number.

- Option 1: 8 - Too low compared to 28.

- Option 2: 22 - Close but not as high as 28.

- Option 3: 28 - Correct as per calculations above.

- Option 4: 18 - Lower than the calculated 28.