• ## Brother X and Y

\”X\” has a little brother called \”Y\”, but \”X\” is not an elder brother of \”Y\”. Why?

Spoiler

\”X\” is an elder sister of \”Y\”.

• ## Strange Twins

Noemi and Rose were born on the same day of the same year of the same father and the same mother. They look almost exactly alike, yet they are not twins. Why?

Spoiler

Noemi and Rose are two members of a set of triplets.

• ## The Dog with the Rope

A dog is tied to leash (rope) which is twenty feet in length yet is able to run to a bone lying fifty feet away.

The leash (rope) does not stretch or break in any way. Why?

Spoiler

Nobody said that the other end of the leash was tied to anything.

• ## Bird on the Moon

Moon\’s gravity is one-sixth of the earth. A bird can fly in 10 meters per second on earth. How fast can it fly on the moon?

Spoiler

The bird cannot fly. Because there is no air on the moon to support flying.

• ## The Organism

An organism, when in the morning, it has four legs, when at noon, it has two legs, when in the evening, it has three legs. What is it ?

Spoiler

The Human Being

Infant stage : 4 legs (2 hands and 2 feet to support movement)

Adult stage  : 2 legs (2 feet to support movement)

Old age       : 3 legs (2 feet plus a “stick” to support movement)