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.
[[-115, -158, -7, 20, -68, -46, 42], [79, -136], [-83, 89, 15], [-21, -149, -59, -93, -159], [-63, -114, 60, -91], [-147, -112, 67]]