Secret Ingredient
Logic puzzles require you to think. You will have to be logical in your reasoning.
Mustapha Scratche, owner of the "Sweaty Chef Kebab Shop" was just about to weigh out the ingredients of his world famous "Colon disinfecting mega grease injection" kebab.
He needed to separate a 20 kg block of the secret ingredient into 2 kg blocks, but could only find a 5 kg and 9 kg weight.
Using a traditional balance scale, how could he measure out the ingredients precisely and as simply as possible?
Answer
Using the 9 kg weight he can measure 9 kg from the 20 kg block. The remaining block of ingredients now weighs 11 kg. He then measures 9 kg from this to leave a 2 kg block. Finally, he can use this 2 kg block to measure and weigh all the rest into 2 kg blocks.
Hide
Comments
Rowsdower
Apr 19, 2004
 Mmmm....Kebabs sound good, but I'm afraid to know what the secret ingredient is. 
madade
Apr 19, 2004
 It is best not to ask 
jimbo
May 02, 2004
 Another (slightly longer) way is to obtain a 9 Kg block; then using the 5Kg weight, leave 4Kg. Now split the 4Kg weight into 2 eqaul portions on the scale.
(Our local Kebab shop is purported to have a secret ingredient but they are still looking for the antidote). 
madade
May 02, 2004
 Antidotes for Kebabs, like salads, are for girls 
davidge02
May 06, 2004
 But if they have to be whole blocks you forgot that the 9 kilogram block will be measured out into 4 2 kilogram blocks with 1 kilogram left over. 
ghostshadow
Jun 04, 2004
 How about measure two 9kg blocks leaving 2kg left over, then use that to way the others. I'm always thinking! 
eighsse
Sep 01, 2013
 Or, put the 5kg weight on one side, and the 9kg weight on the other side. Add a portion of ingredient to the side with the 5kg weight until it is balanced, then, take the weights off and split the 4kg until balanced. (similar but shorter than a previously mentioned method) 
Back to Top
 
