French High School

Dix sacs de 100 pièces d'or sont alignés dans
un coffre fort. Un des sacs est rempli de fausses
pièces, mais on ne sait pas lequel. On sait qu'une
vraie pièce pèse 5g et une fausse 4,5 g.
On dispose d'une balance moderne, qui donne
un poids exact en grammes.
Comment trouver le sac de fausses pièces
en une seule pesée?

Answers

Answer 1

Bonjour,

tu numérotes les sacs

Sur la balance

Tu mets 1 pièce du N°1

puis
2 pièces du N°2

etc...

Tu dois avoir des masses  multiples de 5

Dès que tu n'as plus un multiple de 5, tu sais dans quel sac sont les fausses pièces..

Related Questions

Using the map list a type a product or type of product for each location



1. -La Bretagne: -------------------------------------------------------------------
2. -le Val de Loire: ----------------------------------------------------------------
3. -la Corse: -----------------------------------------------------------------------
4. -la Normandie: -----------------------------------------------------------------
5. -la Champagne: -----------------------------------------------------------------
6. -la Beauce: ---------------------------------------------------------------------
7. -le Bordelais: -------------------------------------------------------------------

Answers

Bonjour,

1. -La Bretagne: lait, viande

2. -le Val de Loire: vin, blé

3. -la Corse: lait, viande, vin, blé, fruit

4. -la Normandie: viande, lait,

5. -la Champagne: vin, blé, betterave à sucre

6. -la Beauce: céréales, betterave

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