Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

Can you solve the below geography rebus by decoding the below rebus ?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

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.