Brain Teaser 1

1. Brain Teaser 1 A 30 year old man married a 25 year old woman. She died at age 50 and her husband was so devastated that he cried for years. Ten years after he stopped crying, he died. If he had lived to be 80. How many years was he a widower? www.mathsrevision.com He was a widower for 25 years. !

2. Brain Teaser 2 If Susan is 10, Arabella is 20, and Jim and Neal are both 5, but Richard is 10. How much is Jennifer by the same system? www.mathsrevision.com Jennifer is fifteen, in a system that awards five for each syllable.

3. Brain Teaser 3 If 2 hours ago it was as long after one o'clock in the afternoon as it was before one o'clock in the morning. What time would it be now? www.mathsrevision.com Nine o'clock. Since there are 12 hours between the 2 times and half of that time is six, then the halfway mark would have to be 7 o'clock. If it were 7 o'clock, two hours ago, the time would now be nine o'clock.

4. I am eight letters long - "12345678" My 1234 is an atmospheric condition. My 34567 supports a plant. My 4567 is to appropriate. My 45 is a friendly thank-you. My 678 is a name.  Q: What word am I? Brain Teaser 4 www.mathsrevision.com MISTAKEN

5. Two boxers are in a boxing match (regular boxing, not kick boxing). The fight is scheduled for 12 rounds but ends after 6 rounds, after one boxer knocks out the other boxer. Yet no man throws a punch. How is this possible?  Brain Teaser 5 www.mathsrevision.com

6. Two mothers and two daughters were fishing. They managed to catch one big fish, one small fish and one fat fish. Since only three fish were caught. How is it possible that they each took home a fish? Brain Teaser 6 www.mathsrevision.com The fishing party consisted of three people. A grandmother, a mother, and a daughter. The mother is both a mother and a daughter. 

7. Brain Teaser 7 If you were to put a coin into an empty bottle and then insert a cork into the neck How could you remove the coin without taking out the cork or breaking the bottle? www.mathsrevision.com Simply push the cork into the bottle and shake the coin out. 

8. Brain Teaser 8 What is at the beginning of eternity, the end of time, the beginning of every end and the end of every place? www.mathsrevision.com "e"

9. Brain Teaser 9 A snail is at the bottom of a well 30 feet deep. It crawls up 3 feet each day, but at night, it slips down 2 feet. How long does it take for the snail to crawl out the well? www.mathsrevision.com 28 days. Once it reaches the top, it does not slip down 2 feet. 

10. A boy leaves his house one summer day and began to run  into the woods to his grandmother's house which is on the other side of the woods. It should also be known that the boy reached his grandmother's house. How far did the boy run into the woods? Brain Teaser 10 www.mathsrevision.com

11. You want to send a valuable object to a friend. You have a box  which is more than large enough to contain the object. You have several locks with keys. The box has a locking ring which is more than large enough to have a lock attached. But your friend does not have the key to any lock that you have. Note that you cannot send  a key in an unlocked box, since it might be copied. How is this done? Brain Teaser 11 www.mathsrevision.com Attach a lock to the ring. Send it to her. She attaches her own lock and sends it back. You remove your lock and send it back to her. She removes her lock.

12. You have two egg timers a 4-minute egg timer and a 7-minute egg timer. You want to measure 9 minutes. How do you do it? Brain Teaser 12 Start both egg timers. When the 4-minute timer runs out, turn it over (4 minutes elapsed). When the 7-minute timer runs out, turn it over (7 minutes elapsed). When the 4-minute timer runs out this time (8 minutes elapsed), the 7-minute timer has been running for 1 minute. Turn it over once again. When it stops, 9 minutes have elapsed. www.mathsrevision.com

13. Brain Teaser 13 If there are fifteen crows on a fence and the farmer shoots a third of them. How many are left? www.mathsrevision.com None they all flew away with noise of the gun.

14. The Lone Ranger rode into town on Friday. He stayed 5 consecutive  days and left on Friday. How could this be?  Brain Teaser 14 www.mathsrevision.com Friday was the name of his horse.

15. Brain Teaser 15 How much dirt is in a hole that is 3 ft deep and 6 inches in diameter?  www.mathsrevision.com

16. Brain Teaser 16 How many times can you subtract the number 5 from 25? www.mathsrevision.com Once. After the first calculation, you will be subtracting 5 from 20, then 5 from 15, and so on.

17. There is a man that lives on the top floor of a very tall building.  Everyday he gets the elevator down to the ground floor to leave the building to go to work.  Upon returning from work though, he  can only travel half way up in the lift and has to walk the rest of the way, unless it's raining!  WHY? Brain Teaser 17 www.mathsrevision.com The man was a dwarf and couldn't reach top liftbuttons except with an umbrella.

18. A man is wearing black. Black shoes, socks, trousers, jumper, gloves, and balaclava.  He is walking down a black streetwith all the street lamps off.  A black car is coming toward him with its lights off too, but somehow manages to stop in time.  How did the driver see the man? Brain Teaser 18 www.mathsrevision.com It was day time.

19. Brain Teasers 19 Is half of two plus two equal to two or three? www.mathsrevision.com Three. It seems that it could almost be either,but if you follow the mathematical orders of operation,division is performed before addition. So... half of twois one. Then add two, and the answer is three.

20. How would you rearrange the letters in the words “ new door” to make oneword? There is only one correct answer.  Brain Teaser 20 www.mathsrevision.com One Word!