This item is basically asking us the least number that can be divided by 5/6 and 2 which will give whole numbers as answers for both. That, in short term, it is asking us the least common multiple of the two numbers. The least multiple of 5 and 6 is 10. When we divide 10 by 2, we get an answer of 5. Therefore, the Chad should buy 5 2-pound bags.