Farm Fair Contest
What is the minimum number of weighing operations required to measure 63 kg of wheat, if only one weight of 1 kg is available?

Anonymous from Somewhere School: Some School  Report Abusive 
Your answer:  9 times 7 
Explanation:  because 9 times 7 is 63 
Clifford from United States School: Washington  Report Abusive 
Your answer:  7 Operations plus 1 to remove the weight. 8 operations. 
Explanation:  Place 1 kg weight on the scale. Balance with one kg of wheat. Place weight on scale with wheat. Now balance with two pounds. Remove and add these two pounds to other side. Now balance with four pounds. Remove these 4 pounds and add to other side with weight and 3 pounds so there's eight pounds. Balance eight pounds. Continue process. 16 pounds, 32 pounds, 64 pounds, remove weight. There should be 63 pounds of wheat. 
ariel from United States School: bsp  Report Abusive 
Your answer:  21 
Explanation:  21 because 36/3=21 
awesome from United States School: Some School  Report Abusive 
Your answer:  21 
Explanation:  21 because 63/3=21 
toobs from Canada School: Some School  Report Abusive 
Your answer:  21 
Explanation:  21 because 63/3=21 
FRANK from Republic of Korea School: IGA  Report Abusive 
Your answer:  I DON'T KNOW 
Explanation: 
