Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

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 does this mathematical rebus means ?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?