If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Which is the correct shadow of the bird?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

A rain drop fell from one leaf to another leaf and lost 1/4th of its volume. It then fell to another leaf and lost 1/5th of the volume. It again fell on another leaf and lost 1/5th of the volume.



This process kept repeating till it fell on the last leaf losing 1/75th of its volume.



Can you calculate the total percentage of loss from the initial volume when the drop has fallen to the last leaf accurate up to two decimal places?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

I have branches, but no fruit, trunk or leaves. What am I?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Spot 5 differences in two Christmas tree below: