What has many keys but can’t open a single lock?

How many times can you subtract the number two from the number fifty?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

What am I?

What does this rebus mean?

O
N
C
E
TIME

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?