What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

Name a key which is hardest to turn.

Why is it very easy to weigh a fish?

Rearrange the letters in "new door" to make one word.

What is the longest word in the dictionary?

Decode below rebus
D
N
A
T
S , D

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.