Boxes Of Balls Riddle
The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.
Boxes are labeled but all labels are wrong!
You are allowed to open one box, pick one ball at random, see its color and put it back into the box, without seeing the color of the other ball.
How many such operations are necessary to correctly label the boxes?
Boxes are labeled but all labels are wrong!
You are allowed to open one box, pick one ball at random, see its color and put it back into the box, without seeing the color of the other ball.
How many such operations are necessary to correctly label the boxes?
Hint:
Just One!
Because we know all labels are wrong.
So the BW box must be either BB or WW. Selecting one ball from BW will let you know which.
And the other two boxes can then be worked out logically. Did you answer this riddle correctly?
YES NO
Because we know all labels are wrong.
So the BW box must be either BB or WW. Selecting one ball from BW will let you know which.
And the other two boxes can then be worked out logically. Did you answer this riddle correctly?
YES NO
Hitchhiking Frog Riddle
Hint:
Natural Phenomena Riddle
This natural phenomena
Is caused by tectonic plates moving
It happens along a faultline
The Richter Scale measures this thing Body parts remaining: 6
Is caused by tectonic plates moving
It happens along a faultline
The Richter Scale measures this thing Body parts remaining: 6
Hint:
A US City Riddle
Im a city but Im not London
I have a famous parade but Im not Rio
Im in the US but Im not Washington DC
I have two baseball teams but Im not Chicago
Im known as a large piece of fruit but Im not Banana Republic
What am I?
I have a famous parade but Im not Rio
Im in the US but Im not Washington DC
I have two baseball teams but Im not Chicago
Im known as a large piece of fruit but Im not Banana Republic
What am I?
Hint:
Afternoon Bike Ride Riddle
Hester goes out for an afternoon bicycle ride. She rides for one hour at five miles an hour, then three hours at four miles an hour and finally two hours at seven miles an hour. How many miles did she ride in total?
Hint:
31 miles.
1 hour at 5 mph = 5 miles
3 hours at 4 mph = 12 miles
2 hours at 7 mph = 14 miles
5 + 12 + 14 = 31 miles Did you answer this riddle correctly?
YES NO
1 hour at 5 mph = 5 miles
3 hours at 4 mph = 12 miles
2 hours at 7 mph = 14 miles
5 + 12 + 14 = 31 miles Did you answer this riddle correctly?
YES NO
A Place With Nothing There Riddle
I have towns but no houses
Rivers but no water
Forests but no trees
And mountains but no rocks.
What am I?
Rivers but no water
Forests but no trees
And mountains but no rocks.
What am I?
Hint: I show you where they are.
Square Rings Riddle
Hint:
Rides At The Fair Riddle
Hint:
Unexpected Visitors Riddle
Its 3am, the doorbell rings and you wake up. Unexpected visitors! Its your parents and they are here for breakfast. You have strawberry jam, honey, wine, bread and cheese. What is the first thing you open?
Hint:
Joseph And Lena Riddle
Joseph and Lena are found dead on the floor with some water around. The windows are open and a strong wind draft is blowing the curtains around. How did they die?
Hint:
Joseph and Lena were goldfishes. The wind tipped their bowl over, hence killing them! Did you answer this riddle correctly?
YES NO
YES NO
A Rickety Bridge Riddle
Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?
Hint:
17 mins.
The initial solution most people will think of is to use the fastest person as an usher to guide everyone across. How long would that take? 10 + 1 + 7 + 1 + 2 = 21 mins. Is that it? No. That would make this question too simple even as a warm up question.
Let's brainstorm a little further. To reduce the amount of time, we should find a way for 10 and 7 to go together. If they cross together, then we need one of them to come back to get the others. That would not be ideal. How do we get around that? Maybe we can have 1 waiting on the other side to bring the torch back. Ahaa, we are getting closer. The fastest way to get 1 across and be back is to use 2 to usher 1 across. So let's put all this together.
1 and 2 go cross
2 comes back
7 and 10 go across
1 comes back
1 and 2 go across (done)
Total time = 2 + 2 + 10 + 1 + 2 = 17 mins Did you answer this riddle correctly?
YES NO
The initial solution most people will think of is to use the fastest person as an usher to guide everyone across. How long would that take? 10 + 1 + 7 + 1 + 2 = 21 mins. Is that it? No. That would make this question too simple even as a warm up question.
Let's brainstorm a little further. To reduce the amount of time, we should find a way for 10 and 7 to go together. If they cross together, then we need one of them to come back to get the others. That would not be ideal. How do we get around that? Maybe we can have 1 waiting on the other side to bring the torch back. Ahaa, we are getting closer. The fastest way to get 1 across and be back is to use 2 to usher 1 across. So let's put all this together.
1 and 2 go cross
2 comes back
7 and 10 go across
1 comes back
1 and 2 go across (done)
Total time = 2 + 2 + 10 + 1 + 2 = 17 mins Did you answer this riddle correctly?
YES NO
Lost Head Riddle
Hint:
Emptying A Backpack
Hint:
Prohibited Chess Riddle
Hint:
Zebra Down The River
Hint:
Just one the zebra. The other 30 animals (5 giraffes and 25 monkeys) were going the other way. Did you answer this riddle correctly?
YES NO
YES NO
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