1991 AMC 8 Question 16
When I follow the steps in the question, I first get rid of the top half. Then for step two, I get rid of the bottom row, which leaves me the third row. Then after the third step, I get rid of the right two numbers in row three. That leaves me only 9 and 10 after step three. Following the same logic and similar way of folding, why is the answer 9 instead of 10 when I fold over the left half?