Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

There is a bag which have 21 blue balls and 23 red balls. You also have 22 red balls outside the bag. Randomly remove two balls from the bag. * If they are of different colors, put the blue one back in the bag. * If they are the same colour, take them out and put a red ball back in the bag. Repeat this until only one ball remains in the bag. What is the color of the sole ball left in the bag ?

What can you catch but never throw?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

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

You need to remove four matchsticks from the picture below and still need to maintain the following as in the original image.
1. 1st row contains 12 matchsticks
2. 2nd row contains 12 matchsticks
3. 1st column contains 12 matchsticks
4. 2nd column contains 12 matchsticks