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Correct Dress Probability Problem

Correct Dress Probability Problem - 31 August

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

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Hard Missing Number Series

Hard Missing Number Series - 30 August

Can you complete below number series by replacing "?" with the correct number.

10 # 10 # 20 # ? # 110 # 300 # 930

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Find Company Name Pictogram

Find Company Name Pictogram - 29 August

Can you find company name from the pictogram below?

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Test Critical Thinking Interview Question

Test Critical Thinking Interview Question - 28 August

This is the interview puzzle asked to my friend in an interview of "blackrock".
As shown in the picture below, There is a circular car race track of 10km. There are two cars, we called them Car A and Car B. And they are at the exact opposite end to each other. At Time T(0), Both cars move toward each other at a constant speed of 100m / seconds. As we know both cars are at the same speed they will always be the exact opposite to each other.
Note, at the center, there is a bug which starts flying towards Car A at time T(0). When the bug reaches car B, it turns back and starts moving towards the car A. The speed of bug is 1m/second. After 5hours all three stop moving. 

What is the total distance covered by the bug?

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Good Age Riddle

Good Age Riddle - 24 August

Lena Dunham , Allison Williams, and Jemima Kirke are 3 daughters of a good mathematician "Geroge".
When I asked George the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters ?

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Oldest Riddle Heard

Oldest Riddle Heard - 23 August

This is the oldest riddle that I have heard.

Once there was a man who is travelling with a Tiger , goat, and grass.
He needs to cross the river that can carry the maximum of two i.e Man + one of Tiger goat or grass. But the problem is "If he takes lion with him, the goat will eat grass and if he takes grass with him, the lion will eat goat".

How can he ensure safe delivery of all three?

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Matchsticks Equation Puzzle

Matchsticks Equation Puzzle - 22 August

You need to move four matchsticks to make matchsticks equation true.

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