2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

What breaks yet never falls, and what falls yet never breaks?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

An explorer goes on an exposition in the jungle. He sets up camp in the middle of the jungle. The next morning he sees something with a head and a tail, but he is not afraid. What did he see in his bag?

I cannot talk, but I always reply when spoken to. What am I?