Latest Infosys Aptitude Question SOLUTION: Ten boxes are there. Each ball weighs 100 gms. One ball is weighing 90 gms. i) If there are 3 balls (n=3) in each box, how many times will it take to find 90 gms ball? ii) with n=

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Ten boxes are there. Each ball weighs 100 gms. One ball is weighing 90 gms.
i) If there are 3 balls (n=3) in each box, how many times will it take to find 90 gms ball?
ii) with n=10
iii) with n=9

Asked In Infosys (12 years ago)

Unsolved Read Solution (4)

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pradeep reddy BK  (12 years ago)

for n=3:

select 1 ball from 3 balls and check weight => 3c1=3 ways
there are 10 boxes so 3*10=30 times .

Is this solution Helpfull? Yes (6) | No (3)  

vishal  (9 years ago)

1)each box has 3 balls.so weigh all the 10 boxes. 1 box is lesser in weight which has 90 gm ball---> 10 ways
then the box has 3 balls.weigh each ball--> 3 ways
so total ways--> 13
2)in a similar way--> 10+10=20 ways
3)10+9=19 ways

Is this solution Helpfull? Yes (5) | No (1)  

swap  (9 years ago)

by using balance we can find it faster
among 10 boxes which weighs more we will need to check 3 times
5-5
2-2 or 1
1-1
i.e 5 boxes on one side while 5 boxes on other side
side which contains 90gm box will have less weight
and go up
in such a way
the ans is
i)"4" for 10box 3 balls in each
ii)"6" for 10box 10 balls in each
iii)"6" for 10box 9 balls in each

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Priyansh  (9 years ago)

Total 3 times for n=3

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