How can one talk without saying a single word?

I have teeth but i don't bite. Who Am I ?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

How can you take 2 from 5 and leave 4?

Replace the question mark with the correct number in below Picture:

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?

What is the Surname of Barbie Doll?

Can you arrange the six given marbles in a manner that each one of them is touching all four marbles of different colours?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?