2015 AMC 10B Problem 5

Attempt Problem 5 of the 2015 AMC 10B below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2015 AMC 10B solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

5.

David, Hikmet, Jack, Marta, Rand, and Todd were in a 1212-person race with 66 other people. Rand finished 66 places ahead of Hikmet. Marta finished 11 place behind Jack. David finished 22 places behind Hikmet. Jack finished 22 places behind Todd. Todd finished 11 place behind Rand. Marta finished in 66th place. Who finished in 88th place?
David
Hikmet
Jack
Rand
Todd
Answer: B
Concepts:logical deduction
Small hint:
Work backward from Marta’s 66th place
Big hint:
Hikmet is 66 places behind Rand
Solution:
Marta finished 66th, so Jack finished 55th. Since Jack finished 22 places behind Todd, Todd finished 33rd. Since Todd finished 11 place behind Rand, Rand finished 22nd.
Hikmet finished 66 places behind Rand, so Hikmet finished 88th.
Thus, the correct answer is B.
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