Problem 12 · Symmetry (mirror pairs) · 4 points
Made by AI and not reviewed by a real person.
Mia has a strip of 12 squares numbered 1 to 12 from left to right. She folds the strip exactly in half, then folds the shorter strip exactly in half again; what is the sum of the four numbers in the final stack containing square 2?
- 28
- 13
- 25
- 26
- 24
Show a hint
- After the first fold, square 2 is stacked with square 11.
- Which first-fold stack joins that pair in the second fold?
Show the answer and solution
Answer: D — 26
The first fold stacks 2 with 11 and 5 with 8. These two stacks join in the second fold, so the final stack contains 2, 11, 5, and 8. Their sum is 26. The choice 13 counts only 2 and 11, forgetting the second fold.