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2015 AMC 12B Problem 4

Problem 4 of 25Easier

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?

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Solution

Marta is 66th, so Jack is 55th. Jack is 22 behind Todd, so Todd is 33rd. Todd is 11 behind Rand, so Rand is 22nd. Rand is 66 ahead of Hikmet, so Hikmet is 88th. (David is 1010th.) Thus, the correct answer is B.

More practice

Concepts: logical deduction · work backwards

Problem text and solution from the LIVE past-contest archive. See also the AoPS wiki page for community solutions.