Final answer:
Zachary needs to spend 7 days making jam to jar 28 liters in total.
Step-by-step explanation:
To determine how many days Zachary needs to spend making jam to jar 28 liters, we can set up a proportion using the relationship mentioned in the question.
We know that Zachary jarred 24 liters in 6 days. So, we can set up the proportion as: 24 liters / 6 days = 28 liters / x days.
To solve for x, we can cross-multiply and then divide: 24x = 6 * 28. Simplifying further, we get: 24x = 168. Dividing both sides by 24, we find that x = 7.
Therefore, Zachary needs to spend 7 days making jam to jar 28 liters in total.