Explanation:
so first off the question tells us there are 90 penguin in total so that would be placed in the first box.
because we know there are 52 female penguin there must be 38 male penguin because
52+38 =90 (90 is the total amount of penguin)
the question tells us there are 6 female emperor penguin, this means that there must be 46 Humboldt penguin because 46+6=52 (total amount of female penguin)
we also know there are 5 emperor male penguin so there must be 33 male Humboldt penguin because 33+5=38
hopefully this was helpful, if it still confused just ask