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

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

You need to arrange three 7 and mathematical symbols to form number 1?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

What goes up but never comes down?

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?

If eleven plus two equals one, what does nine plus five equal?

I have branches, but no fruit, trunk or leaves. What am I?