If U can.....answer this

number them 1 to 5.... and take..

ok.. you got my answer. let others try
What kind of an answer is this? :confused:

IMO, you don't even need to number them 1 to 5.

@vssoma

Is the weight scale like this http://en.wikipedia.org/wiki/File:Bascula_9.jpg ? If yes, then you have to put 2 boxes on each side of the balance. If they are in equilibrium then it means that the remaining 5th box is the one with 9g marbles in it. If they are not, then whichever side is up on the scale i.e. the lighter side, has the box with 9g marbles + one box with 10g marbles.
 

rajeabc

Well-Known Member
What kind of an answer is this? :confused:

IMO, you don't even need to number them 1 to 5.

@vssoma

Is the weight scale like this http://en.wikipedia.org/wiki/File:Bascula_9.jpg ? If yes, then you have to put 2 boxes on each side of the balance. If they are in equilibrium then it means that the remaining 5th box is the one with 9g marbles in it. If they are not, then whichever side is up on the scale i.e. the lighter side, has the box with 9g marbles + one box with 10g marbles.
I thought let people try.. but
name boxes from 1 to 5 and take 1 marble from box 1 and 2 marble from box 2 and 3 from 3rd box 4 from 4th box and 5 from 5th box.
now weigh all these marbles (1+2+3+4+5 =15)
if weight is 14 then ANS is box 1
if weight is 13 then ANS is box 2
if weight is 12 then ANS is box 3
if weight is 11 then ANS is box 4
if weight is 10 then ANS is box 5
 

vssoma

Well-Known Member
Question: Weight the marble

You have 5 boxes and each box has 5 marbles in it. Marbles in 4 bags weight 10g each and in one bag weight 9g each. You don't know which bag has 9g marbles and you are given a chance to use a weight scale for one time.


How can you find the bag with 9g marbles?

Solution:

Number the bags from 1 through 5. Take 1 marble from bag 1, 2 marbles from bag 2, 3 marbles from bag 3, 4 marbles from bag 4 and 5 marbles from bag 5. Now put them on the weightscale. Now there are 5 possible measurements. If all marbles would weigh 10g, the total would be 150g. But one or more marbles weigh 9g. So if you took one 9g marble, the total would be 149g. If you took two 9g marbles, the total would be 148g. And so on.

Therefore, 150-(Measured Weight) gives the bag number which contain 9g marbles.
(Ex: If measured weight is 147g, 150-147=3 is the bag number as you have taken three 9g marbles from bag number 3)
 

PGDIMES

Well-Known Member

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