Chatawut Che

SG chevron_right Primary 6 chevron_right Measurement

Two identical rectangles are intersecting. The intersection area is equal to non- intersection area. If each rectangle area is 48 cm2. What is the total area surrounded by the thick line. (Japanese secondary school entrance exam)Ref: https://m.facebook.com/story.php?story_fbid=10152411067641075&id=749951074

Replies 0

Chatawut Che

SG chevron_right Primary 6 chevron_right Number and Algebra

Problem from japan.Two trains are running in the same direction passing into the tunnel. Both train entered the tunnel at the same time and exit tunnel at the same time. (Tails of both are leaving at tunnel exit)Train A length and speed are 220 and 26m/s, whileTrain B length and speed are 100m and 20m/s.What is the length of tunnel?

Replies 0

Choy Ban Heng

SG chevron_right chevron_right

Hi, I looked back at the problem first posed by Lay Koon here: The problem that seeks to find the strange area in a square. I think it's really a nice question for exploration as it allows different ways of looking at the problem. Here's four different approaches I used to solve the problem. For your reading pleasure over the weekend. :)

Replies 0