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

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

The centre of the third figure is empty. What digit should fit inside?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?

If a wheel has 54 spokes, how many spaces are there between the spokes?

What kind of storm is always in a rush?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?