## idku one year ago little challenge. You have 8 balls (all look and) weight the same BUT 1 of the balls weights less than the rest. You have a scale, and you can use the scale twice. How can you determine which ball is the ball that weighs less ?

1. idku

oh, message. please don't just give it away...

2. sdfgsdfgs

"You have 8 balls (all look and) weight the same BUT 1 of the balls weights less than the rest." I think it should say... "You have 8 balls (all look and) weight the same PLUS 1 balls which weighs less than the rest." :)

3. idku

but is a corresponding conjunction that fits the purpose that I want to indicate. That is, that although 8 balls weight the same, there is an exception (one of the balls weighs less).

4. welshfella

yes but that is 3 weighings

5. sdfgsdfgs

@idku its ur Q so u get to decide how it reads :P i just thought making 9 the total no. of balls will make the Q easier! lol

6. welshfella

if you take 2 pairs of 3 and they weigh the same then the light ball is one of the other 2 You then weigh one against the other to find the light ball.

7. welshfella

oh we have nine balls?

8. welshfella

oh we decide 8 or 9 right?

9. sdfgsdfgs

@welshfella Nope - I thought it was with 9 balls but OP said its 8. either way u got it :)

10. geerky42

$$\color{blue}{\text{Originally Posted by}}$$ @sdfgsdfgs "You have 8 balls (all look and) weight the same BUT 1 of the balls weights less than the rest." I think it should say... "You have 8 balls (all look and) weight the same PLUS 1 balls which weighs less than the rest." :) $$\color{blue}{\text{End of Quote}}$$ I'm sure OP is intended to say first one...

11. imqwerty

the question is what is the final question??

12. welshfella

now if one set of 3 balls weigh differently you take the lightest and pick 2 out and weigh them again If 0ne wieghs light its that one If they weigh the same its the other ball.

13. sdfgsdfgs

correct @welshfella n thats why I thought making a total 9 would be easier. But same method will work for 8.

14. welshfella

good question