One , Weighing rice

Problem description

* existing : rice 9 Kg ,50 One gram weight ,200 One gram weight
* ask : How to weigh only on a balance 3 Second, weigh out 2 Kilogram meter ?
answer

Two , Time calculation of burning rope

Problem description

* Burn an uneven rope , All in all 1 hour . Now there are several ropes of the same material , ask : How to use the method of burning rope 1 Time 15 What about the points ?
answer

Three , Gold bars for workers

Problem description

*
If you let workers work for you 7 day , The reward is a gold bar . The gold bar was divided into two parts 7 paragraph , You have to give them a gold bar at the end of each day . If you're only allowed to break the bar twice , How do you pay your workers ?
answer

Four , Contaminated pills

Problem description

* You have 4 A jar of pills , Each pill has a certain quality , Contaminated pills are the quality of unpolluted pills +1. Weighing only 1 second , How to judge which jar of medicine is contaminated ?
answer

Five , Weighing cans

Problem description

*
The delivery man delivered it to a food company 10 Boxes of canned pineapples . What is the quality of each can 800 gram , In each case 20 individual . But this 10 There is one box mixed with defective products due to machine problems , Every can is 50 The component of gram . So how to weigh out that box of unqualified products at one time ?
answer

Six , Yes 20 How many bottles of soda can you drink for yuan

Problem description

* 1 Yuan for a bottle of soda , After drinking, change two empty bottles for one soda . ask : You have 20 Yuan , How many bottles of soda can you drink at most
answer

Seven , Disappeared 1 Yuan

Eight , Sub items

Problem description

* existing :7 One gram weight ,2 One gram weight , A balance
* ask : How to use these items only 3 The second general 140 G of salt 50,90 One for each ?
answer

* method 1:

* method 2:

* But the method 2 Comparison method 1 good , Because of the method 2 pass the civil examinations 3 It is necessary to put the 1 Find a place to store the weighed salt
Nine , Weigh out 4 Liters of water

Problem description

* If you have infinite water , One 3 Up and one 5 A liter bucket , How do you weigh it accurately 4 Liters of water ?
answer

Ten , Sequencing problem

Problem description

* Yes 4 Balls of the same size , They are methyl ethyl propionate :
* A and B are on the side of the scale , C and D are on the other side , The balance is basically in balance
* Exchange of ethylene and propylene , B and D are heavier on the other side
* One side is Jiading , On the other side is B , B is heavy
* Please sort by weight
answer

eleven , How to weigh it 3 The ball was found every time

Problem description

* Yes 12 Balls , A balance , Now it is known that only one weight is different from the others , ask : How to weigh it 3 I found the ball every time ?
answer

* The difficulty of this problem is that we don't know whether the ball we are looking for is heavier or lighter than others
* The method is as follows :
* take 12 The balls are numbered as 1~12
* First weighing : take 1~4 Put it on the left side of the scale , take 5~8 Put it on the right side of the balance ,9~12 Hold still
* After the first weighing , Divided into the following 3 Situation

twelve ,3 The age of a daughter

Problem description

*
A manager has 3 A daughter ,3 The age of the daughters adds up to 13,3 The age of a daughter multiplied by the age of the manager . One of the subordinates already knows the age of the manager , But the manager is still uncertain 3 The age of a daughter . At this time, the manager said that only one daughter's hair was black , Then the subordinate knows the manager 3 The age of a daughter
* Excuse me? :3 What are the ages of the daughters ? Why?
answer

thirteen , Who will finish first 40 Down the mouse

Problem description

* Ralph participated in the mouse click competition , Willie and Paul . Ralph 10 Seconds can hit 10 Down the mouse ; Willy 20 Seconds can hit 20 Down the mouse ; Paul 5 Seconds can hit 5 Down the mouse
* The time spent by each of the above is calculated as follows : Start with the first strike , To the end of the last strike
* ask : Can they draw ? If not , Who will finish first 40 Down the mouse
answer

  fourteen , be able to develop one 's ability to the full

Problem description

* Doruf , Philip , Robert 3 Young people , One became a singer , One was admitted to university , One joined the US Marine Corps
* Know now :
* A. Robert is younger than a soldier
* B. College students are younger than Philip
* C. Doruf's age is different from that of college students
answer

fifteen , Bridge crossing

sixteen , An untrustworthy word

seventeen , Pirates share gems

eighteen , Insect

nineteen ,30 Second answer

Problem description

* (1) Where do you always find happiness ?
* (2) When a man comes into his garden , Always put what in first ?
* (3) What gets dirtier after washing ?
* (4) What can carry a hundred bales of hay but not a grain of sand ?
* (5) What is more popular when it is broken ?
* (6) What do you never eat at breakfast ?
* (7) What about things that a magnifying glass can't magnify ?
* (8) What increases by half when you stand on your head ?
answer

* (1) In the dictionary
* (2) foot
* (3) water
* (4) water
* (5) record
* (6) dinner
* (7) angle
* (8) number 6
twenty , Number of all lights on

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