Find the next number in the series below

21 32 54 87 131 ?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

There is an ancient kingdom where every married woman keeps information regarding the fidelity of other men. However, what they don't know is the fidelity of their own husbands. Also, there is an ancient belief that they don't tell each other about the fidelity of their husbands.

On a certain day, the queen of the kingdom declares that she has identified at least one unfaithful man in the kingdom. She allows the wives to identify and gives them authority to kill their husbands if they are unfaithful at midnight.

How will the wives manage it?

How can you tell a raw egg from a hard-boiled egg?

What two things can you never eat for breakfast?

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

A B C D E F G H

These are the letters given to you. Now you have to find out the letter that comes two to the right of the letter which is immediately to the left of the letter that comes three to the right of the letter that comes midway between the letter two to the left of the letter C and the letter immediately to the right of the letter F.

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?