How can you write nineteen in a manner that if we take out one, it becomes twenty?

By what process could you make a 'Tea-Table' into food?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

Can you find out which number multiplied by itself will give the output as 12345678987654321?

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

Replace the question mark with the correct number below.

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

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?