Quiz 1

 

As shown in the figure, there is a castle with a 100 meter × 100 meter site, and there is a
moat of ten meters wide around it. In other words, the outside of the moat is 120 meters
×120 meters square. A feudal lord tried to pass a board to the moat and enter the castle
grounds. However, the boards he brought are all 9.8 meters long and one meter wide and
it’s a little short to the width of the wall.

How does he get inside the castle grounds?

(You may use as many boards as you want, but you cannot use nails or ropes to secure the
plates.)

 

Quiz Giver: Hiroki Kodama (R&D Headquarters)

2018- Deputy manager of AIDIP Div. (R&D Headquarters) at Arithmer Inc.
2002-2018 Ph.D in Graduate School of Mathematical Sciences, the University of Tokyo
Postdoctoral fellow at Institut des hautes études scientifiques (ihés)
Special Associate professor of Graduate School of Mathematical Sciences, the University of Tokyo
1999 Master of Mathematical Sciences, the University of Tokyo
1997 Bachelor of Mathematical Sciences, the University of Tokyo
1992 The first Japanese Gold medalist of International Mathematical Olympiad Russia Competition
1991 Silver medalist of International Mathematical Olympiad Sweden Competition