FILE No.41Unsolved
Takashi, a first-grader, lives on the 10th floor of a 20-year-old apartment building. The manager looked at the security camera records and found something puzzling.
On the way home on sunny days, Takashi takes the elevator to the 5th floor and then climbs the stairs to the 10th. But on days of pouring rain from morning, he rode the elevator from the 1st floor all the way to the 10th.
Why could he go to the 10th floor only on rainy days? Look closely at the evidence.
If you get stuck, open the hints one at a time, in order.
Think about how tall a first-grader is.
At what height are the elevator buttons?
What does he carry only on rainy days?
Why could he go to the 10th floor only on rainy days? Look closely at the evidence.
Choose the answer closest to the truth.
He could press the high 10th-floor button with his umbrella
The answer is “he could press the high 10th-floor button with his umbrella.”
Takashi is a short first-grader and cannot reach the buttons above the 5th floor. On rainy days he carries an umbrella, and with it he could press the high button. The stairs are indoors, so rain does not wet them. There is no record that his mother was with him.
You think of the weather’s own effects, such as wet stairs.
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