Problem:
Each day, Jenny ate of the jellybeans that were in her jar at the beginning of that day. At the end of second day, remained. How many jellybeans were in the jar originally?
Answer Choices:
A.
B.
C.
D.
E.
Solution:
Since Jenny ate of the jellybeans remaining each day, of the jellybeans are left at the end of each day. If is the number of jellybeans in the jar originally, then . Thus .
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions