Electronic Weighing machine to find defective chocolate box puzzle
You have ten chocolate boxes containing 10 chocolate each and an electronic weighing machine.
In those ten boxes,
you have chocolates. Each chocolate weigh 20 grams. But in one box the chocolates are defective and each weigh 19 grams exactly.
Now you can weigh in the electronic weighing machine but you can use that machine just once.
How will you find out which box has the defected chocolates.
Assuming that all boxes contain the same number of chocolates AND that the No. of chocolates per box is at least 10:
Number the boxes as 1, 2, 3 etc.
From each box,
Take as many chocolates as its number. (i.e., take 1 chocolate from Box No. 1, 2 pieces from Box No. 2, 3 from No. 3 and so on. Total = 55) Now, weigh the selected chocolates together.
If all chocolates were proper, the total weight would have been 1100 g. (55 * 20 g) Since each defective chocolate is 1 g less than the standard, the total weight would be less by as many grams as there are such defective chocolates in the selection. (e.g. if 5 defective chocolates were taken, the total weight would be 1105 g only.)
Since the No. of chocolates taken is equal to the box number, the difference in weight (1100 – actual) would be the number of the box containing the defective ones.
please correct the figure in 3rd last line , which should be 1095 g only
Your Answer
More puzzles to try-
Truck on a bridge riddle
A semi truck weighing exactly 10,000 pounds(Total Weight of truck) gets onto a bridge that is 100 miles long. The ...Read More »Naked in winter
In spring it is gay in handsome array; In summer more clothing it wear; When colder grows it fling off ...Read More »In the Dark
Planning to roam the countryside and prey upon its defenseless people, the ogre reached into his dark closet. There he ...Read More »Five Hand Creature
I am a normal creature, but I have five hands. I can even have more but even then I will ...Read More »Maths Puzzle
5+5+5=550, use a straight line to prove the equation.Read More »What is the phrase?
What is the word or phrase?Read More »Connecting 9 dots with 4 line puzzle
Look at the 9 dots in this image. Can you draw 4 straight lines, without picking up your pen, that ...Read More »Moon is similar to a dollar
How is the moon similar to a dollar?Read More »Bags of Coconuts
A trader travels from one place to another with 3 bags having 30 coconuts each. No bags can hold more ...Read More »Meeting at a Distance
The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City ...Read More »It is what you love
Ii is what you seek, It is only what is right. It is never wrong. It could be short, It ...Read More »Brilliant students Puzzle
In a university, a professor gave a set of three problems to the three brilliant students of his class. See ...Read More »Crossing Boarder
A man who lived in Mexico wanted to cross the Mexico/America border. The bridge which he is to cross is ...Read More »Securely sending valuable to friend riddle
You have to send a valuable item to your friend. You have big enough box on which you can place ...Read More »More Money Riddle
John had 100k, Jacob has 10k and Johar will have 200k. Who has the most amount of money?Read More »What are the two numbers puzzle?
Two positive integers < 50 are chosen. The sum is revealed to A The sum of the squares is revealed ...Read More »Deduce the amount received
When my uncle in Madura died recently, he left a will, instructing his executors to divide his estate of Rs. ...Read More »Complete the equation
Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the ...Read More »Coins Measuring Brain teaser
There are 6 coins, 4 of which are real and 2 are counterfeit. You are given a weighing balance and ...Read More »Solidify on heat
Ice melts when heated up. But what solidifies when it is heated up?Read More »