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Brain-teasers
Problems
Here are 5 tasks. Keyboard input: you will need to enter one or several values as the answer.
The timer does not affect your place in the solved players list, it only helps you track your pace.
Question 1

Three Birds
Three birds were sitting on a branch; two decided to fly away. How many birds are left sitting on the branch?
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Question 2
Sisters
There are five brothers in the family, all under the age of 18. Each of them has one sister, who is also under the age of 18. How many children are there in the family?
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Question 3
Months
How many months in a year have 28 days?
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Question 4
A 100-story building and glass spheres
There is an unlimited supply of expensive glass balls and a 100-story building. What is the minimum number of balls needed to determine on which floor a ball will break?
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Question 5
Traveler
What can travel the world while staying in the same spot?
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Brain-teasers
A set of problems to test your problem-solving skills
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