2003 AIME II Problem 1

Below is the professionally curated solution for Problem 1 of the 2003 AIME II, from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2003 AIME II solutions, or check the answer key.

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Concepts:Diophantine Equationfactoring

Difficulty rating: 1840

1.

The product NN of three positive integers is 66 times their sum, and one of the integers is the sum of the other two. Find the sum of all possible values of N.N.

Solution:

Let the integers be a,a, b,b, and c=a+b.c = a + b. Then N=abc=6(a+b+c)=62c=12c,N = abc = 6(a + b + c) = 6 \cdot 2c = 12c, and cancelling cc from abc=12cabc = 12c leaves ab=12.ab = 12.

The factorizations (a,b)=(1,12),(a, b) = (1, 12), (2,6),(2, 6), (3,4)(3, 4) give c=13,c = 13, 8,8, 77 and N=12c=156,N = 12c = 156, 96,96, 84.84. The sum of all possible values is 156+96+84=336.156 + 96 + 84 = 336.

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