Question

In a factory there are 7 machines that produces tablets(medicines).Out of the7 ,6 of them are produce tablets of exact weight, the other one producestablets that weigh 1gm less. All the machines are numbered from 1 to 7.Inhow many minimum chances (chances refers to the number of times you usethe balance) can you find out the faulty machine if you are given a balancethat displays the weight digitally.

Answer 1

I came across many questions like this
any method

Answer 2

1

Answer 3

im not good at these problems :( ask more like the ones last night <.<

Answer 4

ok

Answer 5

2

Answer 6

I don't know whether I am right or Wrong .... But I think if defect in weight is an event independent of Machine used then It should be 1(Answer) as there are seven Machines .

Answer 7

but i really need this

Answer 8

these type

Answer 9

ill post that type ques later

Answer 10

k

Answer 11

Tatiana I would Like to know .. How'd u got 2

Answer 12

i think that we dont know weight of one initially

Answer 13

is this a 2 sided scale? (like normal?)

Answer 14

so we have to cross check if thats the one were looking for

Answer 15

@joe i dont know check attachment

Answer 16

can you solve any of them

Answer 17

its digital...so it might only have one place to put stuff on it at a time.
im thinking this:
pick one of them to hold in your hand. Place 3 on the scale and weight them. Then place the other 3 on the scale. If they are both equal in weight, then the one you have in your hand is the lighter one. if one group weighs less than the other, then the lighter one is in that group (thats 2 uses of the scale so far).

Answer 18

For the Second Question .. In ur attachment i think the answer is at least 6

Answer 19

So now you have 3 pills left that might be the lighter one. again, pick one to hold in your hand. and weight the other 2 seperatly. if those 2 are equal, the one in your hand is the lighter one. if not, the lighter one will be....the lighter one lol. (thats another 2 uses) so i think the answer is 4. you would need to use the scale at least 4 times.

Answer 20

can u explain a little ishaan

Answer 21

if we had been using a normal 2 sided scale, the answer would be 2, but since this is a digital scale with only one place to measure something at a time, the answer is 4.

Answer 22

5 tracks 25 horses.

at every trial 4 horses would be disqualified ....24 horses should leave ..and 4x6=24

Answer 23

cant it be like this that u keep 1 pill on the machine note its weight then put another one and note then other one and note and another one and note (thats 3 times)
the odd one is lighter????

Answer 24

sry did 4 times shud be 3

Answer 25

ishaan we have to find fastest 3

Answer 26

i'm with joemath on the first question ...tht would be the best way

Answer 27

sry .. i'l read the question again

Answer 28

for the first problem - about 8 coins
4-4 (one of them will be lighter) take lighter 4
2-2 (one of them will be lighter) take lighter 2
1-1 take lighter
Answer - 3

Answer 29

i believe thats 4 times problem ( im counting where you put the first pill on the scale).

Answer 30

and i agree with tatiana on the coin problem, i think thats right.

Answer 31

no i wrote it 4 times by mistake i sud have written to keep pills 4 times by mistake

Answer 32

@titina Thank u

Answer 33

for 2nd 11 maybe

Answer 34

if u dont have a stopwatch then 11 should be fastest way to take fastest 3

because every time u will need 2 exits ..... so tht sould make 22 horses to exit
and 11 trials

Answer 35

btw, what class are these problems from? there are by far the most interesting problems ive seen in a while <.<

Answer 36

About pills
1) 3-3 (if equal, so light pill found (in hand)- and realy then answet 1), (if one is lighter, then take lighter 3, go to the 2))
2) 1-1 (and 1 in hand) (if equal - in hand is lighter) (if one is lighter then other, then we find lighter as well) - and answer 2
In this problem the most problem is question - how many MINIMUM chanses...

Answer 37

On first question it should be 3 with tatiana on this

Answer 38

ok

Answer 39

@tatiana its a digital scale being used in the pill problem, i dont think digital scales are double sided. Usually you can only weight one group at a time. Thats why I say it takes 4. Otherwise you are 100% correct.

Answer 40

yeah

Answer 41

1st qustion is solved

Answer 42

may I delete about pills then?

Answer 43

no

Answer 44

let it be

Answer 45

In 2nd one problemsolver

there are 25 horses

race horses exit horses remain

1 2 3
2 2 3
.
.
.
11 2 3 the fastest

so it should cont. until 22 horses are disqualified
so tht should make it 11
if u dont have a stopwatch

Answer 46

ok thanks very much