Problem:
A teacher tells the class,
"Think of a number, add to it, and double the result. Give the answer to your partner. Partner, subtract from the number you are given and double the result to get your answer."
Ben thinks of , and gives his answer to Sue. What should Sue's answer be?
Answer Choices:
A.
B.
C.
D.
E.
Solution:
Ben adds to to get , and then doubles to get . Sue subtracts from to get , and then doubles to get .
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions