Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Buy me, smell me or deliver me, I do not change.

Who am I?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

When can we add 2 to 11 and get 1 as the correct answer?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

How many words can a pen with half refill write?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.