Discussion
If 1 + 5 = 11, 3 + 7 = 17, 4 + 9 = 22, then 9 + 12 = ?
Answer: C
The answer is 33.
Each result is the first number plus twice the second:
\[ \begin{aligned} 1 + 2 \times 5 &= 11 \\ 3 + 2 \times 7 &= 17 \\ 4 + 2 \times 9 &= 22 \end{aligned} \]
So \(9 + 2 \times 12 = 33\). 21 is the plain sum, 108 the product, and 26 does not fit.
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