What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Can you find the six hidden animals in the picture below?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

Can you decipher the below rebus?

PBLUESAISNUERSES