In this task, you are given a list. This list contains many lists of integers. The list is several items written within a []. Your task is to find the maximum number among the members of each inner list. The output should be a list comprised of the maximums with the same order as the internal lists.
[[-113, 36, -122, -72, -47], [-168, -23], [76, 65, -142], [-181, 20]]