Charlie has $1000. He can buy his favorite chocolate bar for $1. And there is a promotion: for every 4 chocolate wrappers submitted, the store will give 1 chocolate bar.
What is the maximum number of chocolate bars Charlie can get?
Riddle AnswerGood Riddles
Poisonous Milk Bottle
You are trapped in a room with no food.
After 2 days, you are given 4 bottles of milk out of which one bottle is poisonous.
There is a rat in the room and to find out which bottle is poisonous you can feed milk samples to that rat. But the challenge is that the poison takes effect exactly 10 hours from feeding.
You have only 24 hours in your hand within which you must consume 3 bottles of milk to satisfy your hunger or else you will die.
What strategy would ensure that you drink 3 bottles of milk within 24 hours and survive?
Answer
Feed the rat with milk from one bottle every 1 hour. In this way, if the rat dies after 10 hours, then the first bottle is poisonous.
If the rat does not die after 10 hours, you can drink from milk from the first bottle.
Similarly, if the rat dies after 11 hours, then the second bottle is poisonous, if it dies in 12 hours, the third bottle is poisonous.
However, if the rat doesn’t die even after 12 hours, then the fourth bottle is poisonous and you need not test further.
In this way, you will need a maximum of 12 hours to drink 3 bottles of milk.
3 Hats Puzzle
Three wise men are told to stand in a straight line, one in front of the other. A hat is put on each of their heads. They are told that each of these hats was selected from a group of five hats: three black hats and two white hats. The first man, let’s call him A, at the rear, can see both other men and their hats. The second man, B, in the middle, can see only the last man and his hat. The last man, C, standing at the front of the line, can’t see either of the men behind him or their hats.
None of the men can see the hat on his own head.
When A is asked if he knows the color of the hat he is wearing, he says no. When B is asked if he knows the color of the hat he is wearing he says no. When C is asked if he knows the color of the hat he is wearing he says, “Yes, my hat is black.”
He is correct. How did he come to this conclusion?
Riddle AnswerTwo Hourglasses
You have two hourglasses, a 7 minute one and an 11 minute one. Using just these two hourglasses, how can you accurately time 15 minutes?
Riddle Answer