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f. Johanna folds a piece of paper with the numbers 1 to 36 in half twice (see diagrams).




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Then she stabs a hole through all four layers at the same time (see diagram on the right). Which four numbers does she pierce in doing so?
(A) 
8,11,26,29
(B) 
14,16,21,23
(C) 
14,17,20,23
(D) 
15,16,21,22
(E) 
15,17,20,22

f. Johanna folds a piece of paper with the numbers 11 to 3636 in half twice (see diagrams).\newline\begin{tabular}{|c|c|c|c|c|c|}\newline\hline 11 & 22 & 33 & 44 & 55 & 66 \\\newline\hline 77 & 88 & 99 & 1010 & 1111 & 1212 \\\newline\hline 1313 & 1414 & 1515 & 1616 & 1717 & 1818 \\\newline\hline 1919 & 2020 & 2121 & 2222 & 2323 & 2424 \\\newline\hline 2525 & 2626 & 2727 & 2828 & 2929 & 3030 \\\newline\hline 3131 & 3232 & 3333 & 3434 & 3535 & 3636 \\\newline\hline\newline\end{tabular}\newlineThen she stabs a hole through all four layers at the same time (see diagram on the right). Which four numbers does she pierce in doing so?\newline(A) 8,11,26,29 8,11,26,29 \newline(B) 14,16,21,23 14,16,21,23 \newline(C) 14,17,20,23 14,17,20,23 \newline(D) 15,16,21,22 15,16,21,22 \newline(E) 15,17,20,22 15,17,20,22

Full solution

Q. f. Johanna folds a piece of paper with the numbers 11 to 3636 in half twice (see diagrams).\newline\begin{tabular}{|c|c|c|c|c|c|}\newline\hline 11 & 22 & 33 & 44 & 55 & 66 \\\newline\hline 77 & 88 & 99 & 1010 & 1111 & 1212 \\\newline\hline 1313 & 1414 & 1515 & 1616 & 1717 & 1818 \\\newline\hline 1919 & 2020 & 2121 & 2222 & 2323 & 2424 \\\newline\hline 2525 & 2626 & 2727 & 2828 & 2929 & 3030 \\\newline\hline 3131 & 3232 & 3333 & 3434 & 3535 & 3636 \\\newline\hline\newline\end{tabular}\newlineThen she stabs a hole through all four layers at the same time (see diagram on the right). Which four numbers does she pierce in doing so?\newline(A) 8,11,26,29 8,11,26,29 \newline(B) 14,16,21,23 14,16,21,23 \newline(C) 14,17,20,23 14,17,20,23 \newline(D) 15,16,21,22 15,16,21,22 \newline(E) 15,17,20,22 15,17,20,22
  1. Visualize Folding Process: Visualize the folding process.\newlineWhen Johanna folds the paper in half once, the numbers on the right half 193619-36 will be on top of the numbers on the left half 1181-18. Folding it in half again will place numbers 101810-18 on top of numbers 191-9, and numbers 283628-36 on top of numbers 192719-27.
  2. Determine Hole Position: Determine the position of the hole.\newlineThe hole is stabbed through all four layers, so we need to identify the corresponding numbers on each layer that align with the hole. Since the hole is shown on the right diagram, we can assume it is through the center of the folded paper.
  3. Identify First Layer Numbers: Identify the numbers on the first layer.\newlineThe first layer (the top layer after the second fold) will have the numbers 101810-18. The hole appears to be closer to the left edge, which corresponds to the lower numbers in this range.
  4. Identify Second Layer Numbers: Identify the numbers on the second layer.\newlineThe second layer (the one directly beneath the first layer after the second fold) will have the numbers 191-9. The hole's position will correspond to the same relative position as on the first layer.
  5. Identify Third Layer Numbers: Identify the numbers on the third layer.\newlineThe third layer (the one directly beneath the second layer after the second fold) will have the numbers 192719-27. The hole's position will correspond to the same relative position as on the first and second layers.
  6. Identify Fourth Layer Numbers: Identify the numbers on the fourth layer.\newlineThe fourth layer (the bottom layer after the second fold) will have the numbers 283628-36. The hole's position will correspond to the same relative position as on the first, second, and third layers.
  7. Match Hole Position to Numbers: Match the hole's position to the numbers.\newlineSince the hole is closer to the left edge, we can eliminate options (B), (D), and (E) because they include numbers that are too far to the right (16,21,22,23)(16, 21, 22, 23). Between options (A) and (C), we can see that the hole is not at the very edge, so it is unlikely to be through numbers 88 or 2626. Therefore, option (C) is the most likely correct answer, with the hole piercing through numbers 14,17,20,14, 17, 20, and 2323.

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