When solving the problem of "the largest factor shared by A and B is 4, and the smallest shared multiple is 60, A is 12, how much is B?", Li Hong thinks that the number B is 30. Do you think Li Hong's idea is correct? Please write down your thought process.
在解决"甲、乙两数共有的因数中最大的是4，共有的倍数中最小的是60，甲是12，乙是多少？"这个问题时，李红认为乙数是30．你觉得李红的想法正确吗？请写出你的思考过程．
<result>30</result>