Final answer:
After subtracting the leftover salt, you divide the amount of salt used by the capacity of each jar to find that Mr. Barrows fills 6 jars with 2/3 cup of salt, given that each jar contains 1/12 cup.
Step-by-step explanation:
The student asked how many jars Mr. Barrows could fill with 2/3 cup of salt if he divides it into jars containing 1/12 cup each and has 1/6 cup of salt leftover. To solve this problem, subtract the leftover salt from the total amount of salt to determine how much salt was used to fill jars: 2/3 cup - 1/6 cup = 1/2 cup. Then, divide the amount of salt used by the capacity of each jar: 1/2 cup ÷ 1/12 cup per jar = 6 jars. Therefore, Mr. Barrows fills 6 jars.