To solve this problem, we need to substitute the value of x, which is 20, into the equation y = 1/6x + 3. Here's how you do it:
1. Firstly, we know that the equation is y = 1/6x + 3, and we're trying to find y when x = 20.
2. We substitute the value of x into the equation. That means wherever we see 'x' in the equation, we replace it with 20. This gives: y = 1/6 * 20 + 3.
3. The equation then simplifies to: y = 20/6 + 3.
4. We can then simplify the fraction 20/6 to be approximately 3.3333333333333335.
5. We now add this to 3, which gives us: y = 3.3333333333333335 + 3.
6. After doing that, we find the value of y to be approximately 6.333333333333333.
So, the solution to the problem is 6.333333333333333. Looking at the multiple choice options given in the question, we can round this off and see that none of the options directly match. Therefore, none of the given options A, B, C or D is the right answer.