Find the next number in the series below

21 32 54 87 131 ?

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

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Bay of Bengal is in which state?

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

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

What does this rebus riddle means ?