Find the next number in the series below

21 32 54 87 131 ?

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

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 ?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

How many times can you subtract the number two from the number fifty?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

Buy me, smell me or deliver me, I do not change.

Who am I?

Which is heavier: a ton of bricks or a ton of feathers?