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Non-verbal Reasoning · Question 23 of 65

The figure shows two folds made one after the other, then a punch through every layer.

Question 23

MediumOriginal question

The figure shows two folds made one after the other, then a punch through every layer. Choose the unfolded sheet.

A square sheet, thought of as a 4 by 4 grid: the right half is folded over onto the left half, then the bottom half is folded up onto the top half. One hole is then punched through the folded sheet, in the square at (row, column) (1, 2) of the original sheet.
Options for question 23

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. Open the folds in reverse order. Opening a fold adds the mirror image of every hole across that fold line, because each hole went through both layers.

  2. Opening step 2 (the horizontal fold) gives holes at (1, 2), (4, 2) (row, column).

  3. Opening step 1 (the vertical fold) gives holes at (1, 2), (1, 3), (4, 2), (4, 3) (row, column).

  4. Figure 4 shows these 4 holes.

Worth noting

The folded sheet has 4 layers, so each punch makes 4 holes. A figure with fewer holes has left a fold closed; one with the right number in the wrong places has opened a fold about the wrong line.

Concept
Unfolding a punched sheet: reflect the holes across each fold line
Typical time
70 s
Your time
—
The rule this testsPaper folding and punching
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