18
Part of 2019 AMC 10
Problems(2)
Repeating Decimals in a Base
Source: 2019 AMC 12A #11 / AMC 10A #18
2/8/2019
For some positive integer , the repeating base- representation of the (base-ten) fraction is . What is ?
AMC 10AMC 12AMC2019 AMC 12A2019 AMC 10A2019 AMC
Mind-changing Henry
Source: 2019 AMC 10B #18
2/14/2019
Henry decides one morning to do a workout, and he walks of the way from his home to his gym. The gym is kilometers away from Henry's home. At that point, he changes his mind and walks of the way from where he is back toward home. When he reaches that point, he changes his mind again and walks of the distance from there back toward the gym. If Henry keeps changing his mind when he has walked of the distance toward either the gym or home from the point where he last changed his mind, he will get very close to walking back and forth between a point kilometers from home and a point kilometers from home. What is ?
AMCAMC 10AMC 10 B