Friday

July 25, 2014

July 25, 2014

Posted by **alya** on Wednesday, September 28, 2011 at 8:52am.

- PROBLEM SOLVING IN MATHEMATICS -
**Reiny**, Wednesday, September 28, 2011 at 9:06amtypically in this type of question, you can only use a "fair balance"

1st weighing:

place 3 balls on each side of the balance, that will tell you which set of 3 contains the lighter ball

2nd weighing:

place a ball on each side of the balance, keep the third back in your hand.

a) If they balance, the the ball in your hand is the lightest

b) If the balls don't balance, it will show which is the lightest.

2 weighings are necessary.

- PROBLEM SOLVING IN MATHEMATICS -
**Reiny**, Wednesday, September 28, 2011 at 9:08amshould have said:

2nd weighing:

From the set of balls with the lighter ball, place a ball on each side of the balance, keep the third back in your hand.

etc

**Related Questions**

MTH 156 - The ratio of the distances a 7-iron and a 5-iron will drive a golf ...

math - the ratio of the distances a 7-iron and a 5- iron will dirve a golf ball ...

math - Write the numbers in order of increasing size. 1/2,3/4,2/3,0.95 Convert ...

Chemistry - Iron ores have different amounts of iron per kilogram of ore. ...

Basic Mathematics - A bag contains 2 red balls, 3 blue balls and 5 green balls. ...

Chemistry - The specfic heat of iron is 0.11cal/g C. The heat of fusion of iron...

Chemistry - I looked and could not find anything on iron smelting? Could you ...

Math - A bag contains 5 balls,8 white balls, 9 green balls,7 blue balls& 6 ...

chemistry - The rusting of iron is represented by the equation 4Fe + 3O2 2Fe2O3...

Dr. Bob - Okay now can you read my introduction for me please... INTRODUCTION: ...