A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?
How many triangles are there on the puzzle below?
In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?
