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?

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: 
Anonymous from Somewhere School: Some School  Report Abusive 
Your answer:  63 
Explanation: 
Anonymous from Somewhere School: Some School  Report Abusive 
Your answer:  4 
Explanation:  there are four operations 
