Rearrange the letters in "new door" to make one word.

I am white when I am dirty, and black when I am clean. What am I?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

Can you solve below mathematical equation?

2^1234 - 2^1233

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?