Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

What is the next number in the series?

15 29 56 108 208 ?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

Jack was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?