Oranges on scales.?!
Question: I have 9 oranges , they look identical , but one weighs slightly more than the 8 others, which weigh the same. I have a pair of normal , conventional scales .
What is the most efficient way of finding out which of the oranges is the heavier one. (least amount of times weighing) + explanation how.
Answers: I have 9 oranges , they look identical , but one weighs slightly more than the 8 others, which weigh the same. I have a pair of normal , conventional scales .
What is the most efficient way of finding out which of the oranges is the heavier one. (least amount of times weighing) + explanation how.
Easy man; first take oranges and make three groups of three each.
1st Try:-
Now take any two groups and place one group on 1 side of scale and the other on the other side. Either one of them will be heavier or both will be same. If one of them is heavier then we know the bigger orange is in it. If both are same then the bigger orange is in the 3rd group which wasn't weighed.
Now we have 3 oranges left. We repeat the similar process like first one.
2nd Try:-
Take any two of the remaining 3 oranges and weigh, if one of them is heavier, so you get the heaviest one straight away, if both are same then you know the third one which wasn't weighed is heaviest..
So basically you require just two tries(2 tries)....
You know try it with 12 oranges or even 15 oranges; it can be done with just three tries...
PeaceV
great joke
2
Weigh 3 against 3.
This narrows it down to 3 oranges.
If equal; it is in the 3 other oranges.
Take 2 from the heavier group of 3 and weigh them against each other.
If equal; it is the other orange.
This is not robust, as it does not check the validity of the premise that there is one orange heavier than the others.
weigh all of them - the heaviest one is the winner -can't think of a quicker way :)
umm get a life?
ya i think thatll work
not a joke, a riddle. I can tell you which is the heavy one after two weighings, but you already know that I suspect.
Get a life,weighing oranges on a Saturday night
Well if I HAD to solve this - I would eat them all - and then guess it was orange No 5.
How could anyone claim I was wrong?
put four on one scale and five on the other
if the scales are equal, or the group of four is heavier, it is in the group of four
if the group of five is much heavier, it is in the group of 5
huh???????????????????????????
no idea.....