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

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

Chocolate costs 6 rupees and a Toy costs 5 rupees. If you have 32 rupees in total, how many chocolates and how many Toys can be purchased with that amount?

John: "Hi Teacher, What is your favourite movie ?".
Chemistry Teacher: "Indium Cerium Platinum Iodine Oxygen Nitrogen".
Ten seconds later... John replied I got it.

Do you?

What does this Rebus Picture mean?

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

Which is faster, Heat or Cold ? Explain.

I look at you, you look at me, I raise my right, you raise your left. What am I?

Solve the following series:
AZ, GT, MN, __, YB

Can anyone tell me a word in the English dictionary which has a silent 'z'?