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jmc

prealgebra junior

Problem

A teacher tells the class, "Think of a number, add 1 to it, and double the result. Give the answer to your partner. Partner, subtract 1 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?
(A)
(B)
(C)
(D)
Solution
Ben adds to , getting . Then Ben doubles it, to get . He gives this number to Sue. Then Sue subtracts from the number, to get . Finally, Sue doubles the result to get , and the answer is .
Final answer
C