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.
[[-64, -143], [-102, -53, -167, 56, -22], [7, 87, 1], [-39, 45, -129, 17, 14, 21, -149], [60, -189, 61, -71, 29, -16], [20, 17, 18, 42]]