Answer:

41 (4,000 / 2 = 2,000, / 5 = 400, / 10 = 40, + 1 = 41).
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Question 6:

Find the number that best completes the following sequence:
1 2 4 7 11 ? 22.
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Answer:

16 (each number adds 1, 2, 3, 4, 5, and 6, respectively, to the preceding number).