A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

We have arranged an array of numbers below. What you have to do is use any kind of mathematical symbol you know excluding any symbol that contains a number like cube root. You can use any amount of symbols but you have to come up with a valid equation for all of them.

0 0 0 = 6
1 1 1 = 6
2 + 2 + 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

If you say my name, I will no longer exist. What am I?

What does this rebus means ?

You need to move three matchsticks to form three squares. Can you do it?

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

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

Which is faster, Heat or Cold ? Explain.

What does below pictogram mean?