The answer is D. If you were to add by four each time like Madison, you would get 4, 8,12, 16, 20, and so forth. If you add by 12, you would get 12, 24, 36, 48, and 60 and so on. Looking at the first two numbers, 12 is three times the number 4. Such is true for the next two corresponding numbers. 8 x 3 = 24. You would find this to be true for all the corresponding numbers, therefore Pedro's numbers will be three times Madison's numbers, so the right answer is D.