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Which is Which II (Posted on 2012-02-15) Difficulty: 4 of 5
This is in continuation of Which is Which.

You have ten balls - five red and five black, having precisely the same shape and size. All the red balls weigh differently, i.e. one of them is very heavy, the other heavy, another is medium, another is light and the fifth very light. Each red ball has a black twin of the same weight. It is known that:

(i) A very heavy and a medium ball put together weigh as much as two heavy balls.

(ii) A heavy and a light ball put together weigh as much as two medium balls and:

(iii) A medium and a very light ball put together weigh as much as two light balls.

Determine the least number of weighings required on a balancing scale to determine which is which, given that:

(i) Each ball can only be paired with a ball of like color before weighing, but pairing a given ball with its twin is not allowed.

(ii) Each ball can also be paired with its twin (in addition to a ball of like color) before weighing.

No Solution Yet Submitted by K Sengupta    
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Comments: ( You must be logged in to post comments.)
  Subject Author Date
Some ThoughtsThoughtsBrian Smith2016-07-09 23:13:47
re: questions for clarificationK Sengupta2012-02-16 11:06:13
Hints/TipsTo save people's timebroll2012-02-16 06:34:13
Questionquestions for clarificationDej Mar2012-02-16 03:35:06
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