Find the next number in the series below

21 32 54 87 131 ?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

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

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

How do you go from 98 to 720 using just one letter?

At a bar, three friends, Mr Green, Mr Red and Mr Blue, were having a drink. One man was wearing a red suit; one a green suit; and the other a blue suit. 'Have you noticed,' said the man in the blue suit, 'that although our suits have colours corresponding to our names, not one of us is wearing a suit that matches our own names?' Mr Red looked at the other two and said, 'You're absolutely correct. What colour suit is each man wearing?

To tease, King Akbar told his most clever advisor Birbal to give his daughter one thing that she can eat when hungry, drink if she feels thirsty and can burn if she feels cold. King Akbar was shocked when Birbal gave Akbar's daughter one such thing that satisfies all of the above.

What did Birbal give to Akbar's daughter?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

I’m tall when I’m young, and I’m short when I’m old. What am I?