Problem number 14. The sum of the numbers in the triangle should be twice the sum of the numbers in the circle. What number must replace the question mark? 3, 5, 8, 11, or 16? First, let's find the sum of the numbers in the circle. It's 5 plus 3, which is 8. The sum of the numbers in the triangle needs to be twice that. Twice 8 is 16, because 8 plus 8 is 16. So the question mark plus 5 needs to add up to 16. So the question mark should be replaced with 11, because 11 plus 5 is 16. This is answer choice D.

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