Featuring the unique "ScienceToday" monthly magazine published by Times of India, during 1966-1991.

Friday, November 9, 2007

Coins

Here is the puzzle for Saturday.. in advance..

P 39
Ramu has 9 coins with him. 8 are of 1 gm and 1 is of 2 grams weight. How can you help Ramu to find out the heavier coin in minimum number of weighing and how many weighing it will need?
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1 comment:

Vivek said...

3???

9 -> 4 , 4 and 1

if both 4's weigh equal the other one is the coin else take the heavier four

4-> 2 , 2

take the heavier 2

2-> 1 , 1

-Vivek

November 9, 2007 at 11:28 PM

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