Problem:
Cindy was asked by her teacher to subtract 3 from a certain number and then divide the result by 9 . Instead, she subtracted 9 and then divided the result by 3 , giving an answer of 43 . What would her answer have been had she worked the problem correctly?
Answer Choices:
A.
B.
C.
D.
E.
Solution:
Let be the number she was given. Her calculations produce
so
The correct answer is
The problems and solutions on this page are the property of the MAA's American Mathematics Competitions