Which alphabet letter is a question?

What is the word or phrase below?
R | E | A | D

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Find the next number in the series below

21 32 54 87 131 ?

In an office's desk, you find a unique method that shows the current day of the month. Two numbered cubes are used to depict the current date.

Can you find out the numbers on both the cubes so that each date can be mentioned using them?

Please note that you have to use both the cubes to display any date. Thus the 1st day must be represented by 01 and so on.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

In a classic wine shop, the list of three most popular wines are:
- The cost of 1 French wine bottle: 500$
- The cost of 1 German wine bottle: 100$
- The cost of 20 Dutch wine bottles: 100$

John entered the wine shop and he needs to buy
- All three types of wine bottles.
- Needs to buy Dutch wine bottles in multiples of 20.
- Need to buy 100 wine bottles in total.

John has only 10000$. How many wine bottles of each type, John must buy?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag