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
Rivers With No Water Riddle
Hint: I represent an area of land or sea.
It Follows A River While Standing Still
Hint:
2 Fathers And 2 Sons Riddle
Hint:
One of the 'fathers' is also a grandfather. Therefore the other father is both a son and a father to the grandson.
In other words, the one father is both a son and a father. Did you answer this riddle correctly?
YES NO
In other words, the one father is both a son and a father. Did you answer this riddle correctly?
YES NO
A Nose That Grows
Every time a man lies his nose grows to 150 percent of its size. Every time he tells the truth it shrinks to 50 percent of its size.
What will happen if he alternates between lies and the truth
What will happen if he alternates between lies and the truth
Hint:
For every pair of a truth and a lie his nose will shrink to 75 percent of its previous size prior to this truth and lie. So the correct answer is 0. As the number of times he tells a lie and the truth ((3/4)n) approaches infinity the length of his nose approaches 0. Did you answer this riddle correctly?
YES NO
YES NO
1 Year Of Chickens
There are five hen and rooster pairs. Each pair has one baby every month.
How many chickens will there be in one year?
How many chickens will there be in one year?
Hint:
It is impossible to know because the chicken's babies could also have babies during this time.
Did you answer this riddle correctly?
YES NO
Did you answer this riddle correctly?
YES NO
Cowboy Rides Into Town On Friday
Hint:
I Grow In Trees
Hint:
A bird.
They are hatched and raised in trees (nests), don't have teeth in the traditional meaning of teeth and they lay eggs, which look nothing like a bird.
Did you answer this riddle correctly?
YES NO
They are hatched and raised in trees (nests), don't have teeth in the traditional meaning of teeth and they lay eggs, which look nothing like a bird.
Did you answer this riddle correctly?
YES NO
Wearing Rings Riddle
Hint:
I Have Rivers But No Water Riddle
I have rivers, but don't have water. I have dense forests, but no trees and animals. I have cities, but no people live in those cities. What am I?
Hint:
Always Riding Piggy Back Riddle
Im red or blue or green or black.
You zip my zippers here and there.
Im always riding piggy back.
Hint:
Over 1,000 People Went Down Riddle
Over 1,000 people went down on me. I wasnt a maiden for long. Something really big and hard ripped me open. What am I?
Hint:
In A Basket All Alone Riddle
Once a little babe was drifting
In a basket all alone,
When the king's fair daughter found him-
Wished to have him for her own.
So she found the baby's mother
For his nurse that very day
But when he had grown to manhood,
He his people led away.
Who was he?
In a basket all alone,
When the king's fair daughter found him-
Wished to have him for her own.
So she found the baby's mother
For his nurse that very day
But when he had grown to manhood,
He his people led away.
Who was he?
Hint:
On Top A Joppa House Riddle
There was a man who went one day
On top a Joppa house to pray,
And while he waited for his meat
He dreamed he saw a great big sheet
Let down from heaven, and inside
Fowls and creeping things did ride,
The one who prayed was told to eat,
For God had cleansed this "common" meat.
Who was he?
On top a Joppa house to pray,
And while he waited for his meat
He dreamed he saw a great big sheet
Let down from heaven, and inside
Fowls and creeping things did ride,
The one who prayed was told to eat,
For God had cleansed this "common" meat.
Who was he?
Hint:
Eyes Underground Riddle
I may grow underground, but I also have eye. When I land on your dinner plate, you call me french fries. What am I?
Hint:
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