1) You have 8 coins. 3 of them weigh x units, 3 y
units, 1 a units and 1 b units. They are all mixed and look
identical. You have to find the lightest coin in minimum
number of weighing .
Answers were Sorted based on User's Feedback
Answer / pratik taank
Hi Dinesh,
This is regarding ur above answer.
i think u are wrong.
Step-1 is ok.
Step-2 is not - Plz see explanation below.
When in step-2 u divide 4 coins in 2 pairs, it is not necessary that lighter coin will be on the lighter side, it can be on a heavier side for ex -
there r 4 coins, their wts are 2gm, 8gm, 3gm, 4gm
put them in balance- 2gm and 8gm on 1 side
3gm and 4gm on other side.
now the lighter coins is in heavier side, now u have ignored this logic. try something new buddy!!!
Is This Answer Correct ? | 6 Yes | 1 No |
Answer / pratik
Shreyas, you don't know which is x and which is y (since
all coins are alike) , that was mistake i was doing before.
Is This Answer Correct ? | 5 Yes | 4 No |
Answer / ankita
We can make pair of two. Then out of each pair, find out the lightest and then form two pairs. Again find the lightest coin in each pair and then form a pair of obtained coins. Lightest of these two is the one required. Total 7 steps. I think this is the answer.
Is This Answer Correct ? | 4 Yes | 4 No |
Answer / shreyas
They look alike means that they are identical in size and shape.
It can still be named as X, Y, A and B.
Its like Rs.1, Rs.2, Rs.3 are in the same shape and size. But you can tell which is what.
Is This Answer Correct ? | 5 Yes | 8 No |
Answer / dinesh thouna
as there are 8 coins..put 4 on one side and the other remaining 4 on the other side.. obviously one side will be lighter..
now the possible combinations of coins which can be on the lighter side are:
1)x,x,,x,a 2)x,x,x,b 3)x,x,x,y 4)x,x,y,y 5)3)x,x,y,a 4)x,x,y,b 5)x,x,a,b 6)x,y,a,b 7)x,y,y,a 8)x,y,y,b 9)x,y,y,y 10)y,y,y,a 11)y,y,y,b 12)y,y,a,b
well whatever the combination be, you need to divide it again into a group of 2-2..you will again get a lighter group..finally compare the last two coin and u will get the lightest coin of the 8 coins given...
so, that makes a total of 3 steps..
thumbs up..!! :)
# refer the above possibilities to get a clearer picture
Is This Answer Correct ? | 2 Yes | 5 No |
Answer is 1.
We will use a weigh measurement machine.
Initially, it will show weight @ zero. Now start putting coin one-by-one and measure the weight every-time a coin is placed. Where the difference in unit weight is minimum, then that coin will be the lightest.
Eg. when coin 1 is placed- total weight = 30 gms
when coin 2 is placed- total weight = 40 gms (cumulatively)
when coin 3 is placed- total weight = 45 gms (cumulatively)
So the lightest coin is 3rd coin.
Is This Answer Correct ? | 7 Yes | 12 No |
Answer / shreyas
Weigh X and Y. And see which is the lightest.
take the lightest of X and Y and weigh it against A or B. See which is the lightest among them and weigh it against the remaining coin.
So the answer is 3 weighs.
Is This Answer Correct ? | 2 Yes | 15 No |
Answer / pratik
3
1. 3 coins of x unit on 1 side and 3 coins of y unit on the
other (let winner is x)
2. a coin of a unit on 1 side and a coins of b unit on the
other (let winner is a)
3. a on 1 side and x on the other (winner declared)
Is This Answer Correct ? | 13 Yes | 30 No |
1/3 rd of the contents of a container evaporated on the 1st day. 3/4th of the remaining contents of the container evaporated on the second day. What part of the contents of the container is left at the end of the second day?
where will be the handle for a cup?
name the cities which consist of a fruit name in its starting?
Write 1111......(243 times) i.e. a 243 digit number with all 1s. Prove that it is divisible by 243.
what will the Next no. 10,20,30,68,__
7 Answers Apalya Technologies, EXL, Genpact, Schneider,
There is a family party consisting of two fathers, two mothers, two sons, one father-in-law, one mother-in-law, one daughter-in-law, one grandfather, one grandmother and one grandson. What is the minimum number of persons required so that this is possible?
why the students are lag for answering this type of questions?
Five friends with surname Batliwala, Pocketwala, Talawala, Chunawala and Natakwala have their first name and middle name as follow. 1. Four of them have a first and middle name of Paresh. 2. Three of them have a first and middle name of Kamlesh. 3. Two of them have a first and middle name of Naresh. 4. One of them have a first and middle name of Elesh. 5. Pocketwala and Talawala, either both are named Kamlesh or neither is named Kamlesh. 6. Either Batliwala and Pocketwala both are named Naresh or Talawala and Chunawala both are named Naresh. 7. Chunawala and Natakwala are not both named Paresh. Who is named Elesh?
Certain words are coded as follows : BEAR-9281, DRUM-0683,PRY- 485 AND DOOR-7899.What is the code for ‘R’?
I'm 11 letters word & a famous place in India,letters 6,7,8,9,10,11 is a fruitand 6,7,5,3 a part of face,6238 a geometrical shape.783 a bird.find me
11 Answers ACC, Raisoni, Tech Mahindra,
Because cigars cannot be entirely smoked, a Bobo who collects cigar butts can make a cigar to smoke out of every 3 butts that he finds. Today, he has collected 27 cigar butts. How many cigars will he be able to smoke?
You have 8 marbles. 7 marbles weigh 1 ounce each, & one marble weighs 1.5 ounces. You are unable to determine which is the heavier marble by looking at them. You have a weighing scale that consists of 2 pans, but the scale is only good for 2 total weighings. How can you determine which marble is the heaviest one using the scale & in 2 weighings?