FILE No.51Unsolved
Monday. Kohei, a sixth-grader, forgot to write his homework diary and wrote it early in the classroom.
Kohei had played video games all day yesterday and did not remember it, so he lied. He wrote: "Yesterday was Sunday. I spent all day with my little brother. In the morning we played catch at the nearby park. At noon we played at the arcade in front of the station. In the evening we played video games together at home."
A classmate who came in looked at the diary and said right away, "That’s a lie."
Why was it exposed as a lie? Compare the evidence with the diary.
If you get stuck, open the hints one at a time, in order.
Compare the “with my brother” parts of the diary with the evidence.
Check what his brother does on Sundays.
What happens to that plan in yesterday’s weather?
Why was it exposed as a lie? Compare the evidence with the diary.
Choose the answer closest to the truth.
It was clear yesterday and his brother practiced at the field from morning to evening
The answer is “it was clear yesterday and his brother practiced at the field from morning to evening.”
His brother belongs to a soccer club in the city and practices outdoors from 9 a.m. to 5 p.m. on Sundays. Practice is canceled in rain, but yesterday was clear from morning to night, and practice went ahead as planned. So during the morning and noon when the diary says the brother was with him at the park and arcade, he was actually at the field. The arcade and park were both open yesterday, so “closed” and “under construction” are no reasons. Whether the brothers get along is something the classmate cannot know.
You doubt places and times in the diary and do not check the brother’s schedule.
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