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Question
What the next number should be? 11,22,13,26,15,30,17

A. 28
B. 32
C. 34
D. 47

Answer
Hello, Draoderick.

The correct answer is C (34).

In the sequence, you first add 11 (11+11=22). Then, after subtracting 9, you add 13 (13+13=26). After subtracting 11, you add 15 (15+15=30). Then 13 is subtracted, so the next step would be to add 17. 17+17=34.

Hope this helps.

Regards,
John

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John Zalewski

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I can help you solve problems involving fractions, decimals, ratios, and algebra. I can teach you how to do math faster, and even in your head. I can teach math definitions, and help you study, if necessary. Please do not ask any graphing, trigonometry, or calculus questions. Try to work through homework questions before asking for assistance.

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I routinely process numbers of all kinds in my head, without need of a calculator.

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I was an A math student while in high school.

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