What number should come in place of the question mark below?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

Why did the Girl throw the butter out of the window?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

What does this rebus mean?

O
N
C
E
TIME

Can you replace the question mark with the correct number in the below table sequence?

What brings you down but never up?

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.