Interested to Buy Any Domain ? << Click Here >> for more details...
there are 6 balls all of same weight except one ball. u r
given a weighing balance. in how many trys can u find the ball
tat has different weight? (the ball can b heavier or lighter
than the rest)
- 10 Answers
- 31822 Views
- Exilant, I also Faced
- E-Mail Answers
Answer Posted / lion251
Three tries will always be enough.
Start by weighing balls 1,2 together (left) against balls 3,4 (right).
If the balance is equal, then we know that balls 1,2,3,4 are normal. Then weigh ball 5 against a 'normal' ball (one of 1,2,3,4). If the balance is equal, then 6 is the different ball, else 5 is different.
If the balance tipped was unequal on the first measurement, then we know that either one of the two balls on the lower side is too heavy, or one of the two balls on the higher side is too light.
Then, weigh the two balls that were on the lower side against each other. If one side goes down, then that is the different ball, and it is too heavy. If the scales balance, then weigh the balls that were on the higher side in the first measurement against each other. The side that goes up holds a ball that is too light.
Thus, three measurements will always be enough.
It is interesting to know that, in the same three measurements, you can even find out a different ball from a group of 12(!). That is quite a bit more difficult, but even then, three measurements will be enough in all cases (provided you choose your weighings extremely carefully)
| Is This Answer Correct ? | 6 Yes | 0 No |
Post New Answer View All Answers
At 6o'clock ,a watch strokes 6 times.The time between first and last is 30secs.At midnight 12o' clock how much time for all strokes?
4_4_4_4=22 use all sign of maths
Three members are hunting in a forest.While crossing a streem cartridges of two of them gets wetted up.Then the third person decides his cartidges equally. After 4 shots of each person, total cartridges remaining are equal to what each had initially after sharing.How many total cartridges they initially they shared?
Wo kay chej hi jo saal may 1 baar aata hai months may 2 baar aata hai weeks may 4 baar aata hai or din may 6 baar
plz send me aptitude test questions on my email id bpraichur@gmail.com
sir i need catholic syrian bank previous question papers fully. it will be helpful for me to greater extend .please do the needful to me.
P pages read in d mins after day p+1 pages read in d+1 mins last day 379 pages done in 317 mins find p+4
In rail road there are some stations. Each station should have tickets to all other stations.If they add some new stations they need 46 more tickets.How many stations are there before and after adding the stations?
what three specific job positions do you target from qatar airways group u.k?
Ship is 180 miles away from shore. At that time a plane started from shore to pass some information to the ship with 10 times velocity of ship's velocity. At what distance from shore they will meat?
what job position/s are you currently holding with your current employer?
why should we hire the others waiting to be interviewed?
In a soap company a soap is manufactured with 11 parts. For making one soap you will get 1 part as crap. At the end of the day u have 251 such scraps. From that how many soaps can be manufactured?
4 cards are placed on a table, each card has two colors. U don't know the color of the back side of eachcard.4 persons A B C and D are sitting on the table before the cards. They can see Red, Green Red and blue.Out of the 4 poeple 2 always lie. They see the color on the reverse side and give the following comment A: Yello/green B: Neither Blue/nor Green c: Blue/Yello D: Blue/ Yello find out the color on the other side of the 4 cards. No. of animals is 11 more than the no. of birds. If the no. of birds were the no. of animals and no. of animals were the no. of birds( ie., interchanging no.s of animals and birds.), the total no. of legs get reduced by one fifth (1/5). How many no. of birds and animals were there?
Three neighbours are there. 1st one lends 2nd and 3rd that many no.of tractors that then already each had.After few months , 2nd lends to 1st and 3rd that many tractors then they had. After a few months 3rd lends to 1st and 2nd that many tractors then they had.Now each of them got 24. Find howmany they had initially?
