There are 4 keys and 4 locks. What is the maximum number of times you need to try the locks so as to match all 4 keys to their locks?
Riddle AnswerMath Riddles
Spider’s Web Puzzle
A spider is trying to build a web for itself. The web built by it doubles every day.
If the spider completely built the web in 15 days, how many days did it take for the spider to build 25% of the web?
Riddle AnswerProbability That Both Children Are Boys
Mr. Smith has two children. At least one of them is a boy. What is the probability that both children are boys?
Riddle Answer2 Apples of 1 Kind
Three kinds of apples are mixed randomly in a box. How many apples must you take out to be sure of having at least two apples of one kind?
Riddle Answer2 Eggs 100 Floors
You are given two eggs, and access to a 100-storey building. Both eggs are identical. The aim is to find out the highest floor from which an egg will not break when dropped from a floor. If an egg is dropped and does not break, it is undamaged and can be dropped again. However, once an egg is broken, it cannot be used anymore.
If an egg breaks when dropped from floor N, then it would also have broken from any floor above that. If an egg survives a fall from floor N, then it will also survive any fall below floor N.
What is the minimum number of egg drops required to find the solution?
Riddle Answer