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.
[[-159, 51, -75, 25, 5], [-91, -70, -31, -13], [78, 20], [-134, 90, 42, 46, -129, 100, -120]]