An intelligent trader travels from one place to another with 3 sacks having 30 coconuts each. No sack can hold more than 30 coconuts. On the way, he passes 30 check points. At each check point, he has to give one coconut for every sack he is carrying. What is the maximum number of coconuts that he can have with him at the end of his journey?
Riddle AnswerHard Riddles
Mr Tan’s Birthday
Ben and Mark are students of Mr Tan. Mr Tan’s date of birth is on N/M/1970 and both of them know that Mr Tan’s birthday is one of these 10 dates:
4/3/1970 5/3/1970 8/3/1970 4/6/1970 7/6/1970 1/9/1970 5/9/1970 1/12/1970 2/12/1970 8/12/1970
Mr Tan tells Ben the value of M and tells Mark the value of N. Then Mr Tan asks them: “Do you know when my birthday is?”
Ben says: “I don’t know, but I can be sure that Mark doesn’t know either.”
Mark says: “Initially I don’t know, but now I do.”
Ben says: “Oh, then now I know it too.”
Based on this dialogue and the dates given, can you figure out which is the correct date of Mr Tan’s birthday?
Riddle AnswerFlashlight and 8 Batteries
You have 8 batteries (4 charged batteries, 4 uncharged batteries) and a flashlight which needs 2 charged batteries to work.
You do not know which batteries are charged and which ones are uncharged. What is the least number of attempts to make the flashlight work? (An attempt consists of putting two batteries in the flashlight and checking if the flashlight works or not.)
Riddle AnswerYesterday, Tomorrow, Today
2 Coconuts 100 Floors
You have two coconuts and you want to find out how high they can be dropped from a 100 story building before they break. Now, the elevator in this building costs a quarter to operate-meaning you want to minimize the number of trips you must take.
So how many trips would it take at most to figure out how far the coconuts can fall?
Bear in mind the coconuts are identical; they’ll break at the same point. Also, if they don’t break, they’re considered as good as new.
Riddle Answer