Find the next number in the sequence

1, 2, 6, 21, 88, __?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Paul's height is six feet, he's an assistant at a butcher's shop and wears size 9 shoes. What does he weigh?

Move four matchsticks to the below square to form three squares?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

How can I get the answer 24 by only using the numbers 8,8,3,3?

You can use the main signs add, subtract multiply and divide.

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