In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

Find the next number in the series below

21 32 54 87 131 ?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

What does man love more than life, and hate more than death or mortal strife; that which satisfied men want; the poor have, and the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

They are three errirs in this question. Can you find them?

Can you spot the hidden girl in the picture below?