Final answer:
The value of j when the ratio of j to 40 is 1 to 2 is found by creating a proportion and solving for j, which results in j equaling 20.
Step-by-step explanation:
The ratio of j to 40 is given as 1 to 2. This means for every 1 part of j, there are 2 parts of the number 40. To find the value of j, we can set up a proportion: 1/2 = j/40. By cross-multiplying, we have 1 * 40 = 2 * j, which simplifies to 40 = 2j. Dividing both sides by 2 gives us j = 20. Therefore, the value of j is 20, which corresponds to option C.