Dale has a box that contains 20 American quarters and 20 Canadian quarters. If he takes them from th

Dale has a box that contains 20 American quarters and 20 Canadian quarters. If he takes them from the box one at a time, how many must he remove before he is guaranteed to have 5 quarters from the same country?

Worst case scenario, Dale picks 4 American and 4 Canadian quarters which guarantees his next pick would be a 5th of either quarter.

So the answer is 4 + 4 + 1 = 9