## Tuesday, August 21, 2012

### Determine which jar has the heavier marbles in the least amount of weighings

You have 10 jars .Each jar has 100 marbles

9 of the 10 jars -> each marble weighs 1 gram each

last jar -> each marble weights 1.1 grams each

electronic weight scale

- place what you want to weight on it

- hit a button

- get the total weight

find the defective jar ?

Answer:Take 1 marble from jar 1, 2 from jar 2, 3 from jar 3 and so on...so u have 55 marbles in all

Weigh them all together...if total weight is 55.1....then jar 1 is the one with obese marbles...if 55.2..then jar 2...and so on... again 55.3 can't be the combination of jar 1 and 2 as (.1 +.2 ) since defective jar is only one.

9 of the 10 jars -> each marble weighs 1 gram each

last jar -> each marble weights 1.1 grams each

electronic weight scale

- place what you want to weight on it

- hit a button

- get the total weight

find the defective jar ?

Answer:Take 1 marble from jar 1, 2 from jar 2, 3 from jar 3 and so on...so u have 55 marbles in all

Weigh them all together...if total weight is 55.1....then jar 1 is the one with obese marbles...if 55.2..then jar 2...and so on... again 55.3 can't be the combination of jar 1 and 2 as (.1 +.2 ) since defective jar is only one.

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