Challenging brain teasers challenge your ability to solve the puzzles. They are not that easy to be solved.They require logical as well as conceptual thinking.

Here are some of them.
• Views : 50k+
• Sol Viewed : 20k+

# Challenging Brain Teasers #1 - Number FAQ Puzzle

Difficulty Popularity

There is an integer, which holds a very special property. If you subtract any number from that integer, the resultant is exactly divisible by the successor of that number.

Can you find out that integer?

• Views : 70k+
• Sol Viewed : 20k+

# Challenging Brain Teasers #2 - Famous Elevator Riddle

Difficulty Popularity

Tanu lives on the 13th floor takes the elevator down to the ground floor every morning and goes to her office.

In the evening, when she comes back on a rainy day , or if there are other people around in the elevator, she goes to her 13th floor directly. Otherwise, she goes to the 1oth floor and walks up three flights of stairs to his apartment.

Whats the reason for her unusual behavior ?

• Views : 80k+
• Sol Viewed : 20k+

# Challenging Brain Teasers #3 - Crossing Bridge Brain Teaser

Difficulty Popularity

Four friends need to cross a dangerous 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?

• Views : 70k+
• Sol Viewed : 20k+

# Challenging Brain Teasers #4 - Interesting Bet Puzzle

Difficulty Popularity

In a bowl, there are several chits with distinct numbers on them. You have to choose any two of them at random.

Will you accept the 2 to 1 bet that the numbers will be relatively prime will you accept it?

For instance:
If the numbers you pick are 6 and 13, you lose \$1.
If the numbers you pick are 5 and 25, you win \$2.

• Views : 70k+
• Sol Viewed : 20k+

# Challenging Brain Teasers #5 - Dream Puzzle

Difficulty Popularity

Two brothers were watching a horror film on video late one night. One brother dozed off and dreamed that he was being chased by the crazy man from the movie, who was trying to kill him. In the dream, he hid in a cupboard. There was no sound except his heart pounding, and he had no idea where his crazed captor was. He was terrified! At that moment, the video finished, and his brother put his hand on the shoulder of his sleeping sibling to wake him. The shock at that tense moment was enough that the sleeping brother suffered a massive heart attack and died instantly. True or false?

• Views : 80k+
• Sol Viewed : 20k+

# Challenging Brain Teasers #6 - Colditz Pascal Prison Escape Puzzle

Difficulty Popularity

Two world's famous prisoners 'Colditz' and 'Pascal' are locked in a cell.
They plan to escape from the cell.
They noticed there is an open window at 40 feet above the ground level.
Both of them tried very hard but are never able to reach there.

Then both of them decided to plan to escape by a tunnel and they start digging out.
After digging for just 5 days, Colditz and Pascal comes out with the much more easier plan than tunneling and they escaped.

what was the plan ?

• Views : 90k+
• Sol Viewed : 30k+

# Challenging Brain Teasers #7 - Popular Interview Problem

Difficulty Popularity

I have two rectangular bars.

They have property such that when you light the fire from one end , it will take exactly 60 seconds to get completely burn.
However they do not burn at consistent speed (i.e it might be possible that 40 percent burn in 55 seconds and next 60 percent can burn in 10 seconds).

Problem is : How do you measure 45 seconds ?

• Views : 40k+
• Sol Viewed : 10k+

# Challenging Brain Teasers #8 - Science Balance Brain Teaser

Difficulty Popularity

You have a broom which you balance on your finger keeping your finger exactly on the broom's center of gravity. You mark that point with the help of a marker. Now you cut the broom from there and are left with two different pieces one of which is longer than the other. The longer piece has the handle part whereas the shorter one comprises of bristles and some party of the handle.

Now, if you weigh the two pieces, which one of them will weigh more?

• Views : 80k+
• Sol Viewed : 20k+

# Challenging Brain Teasers #9 - Switch Chances Interview Problem

Difficulty Popularity

You are sitting in front of your interviewer. He gives you three envelopes. One of them contains an offer letter and the other two are empty. You pick up one of them. Now, the interviewer opens up one of the envelope lying on the table and you find out that it is blank.

Now, he gives you a chance to switch your envelope with the one on the table. Would you switch it? Why or why not?

• Views : 30k+
• Sol Viewed : 10k+

# Challenging Brain Teasers #10 - Interesting Misplaced Pens Riddle

Difficulty Popularity

Rihanna brought home 150 pens but while packing them, she misplaced some of them. When her brother asked how many she had misplaced, she told him:
If you count in pairs, one will remain
If you count in a group of three, two will remain
If you count in a group of four, three will remain
If you count in a group of five, four will remain
If you count in a group of six, five will remain
If you count in a group of seven, nothing will remain.

How many pens do you think has she misplaced ?

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