Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

How can you tell a raw egg from a hard-boiled egg?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

How far can you walk into the woods?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

How many triangles can you count in the figure given?

Solve the counting riddle by identifying the number of triangles in the given picture.

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

How do you go from 98 to 720 using just one letter?