1993 AIME Problems/Problem 3

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Problem

The table below displays some of the results of last summer's Frostbite Falls Fishing Festival, showing how many contestants caught $n\,$ fish for various values of $n\,$ .

$\begin{array}{|c|c|c|c|c|c|c|c|c|} \hline n & 0 & 1 & 2 & 3 & \dots & 13 & 14 & 15 \\\hline \...$

In the newspaper story covering the event, it was reported that

(a) the winner caught $15$ fish;

(b) those who caught $3$ or more fish averaged $6$ fish each;

(c) those who caught $12$ or fewer fish averaged $5$ fish each.

What was the total number of fish caught during the festival?

Solution

Suppose that the number of fish is $x$ and the number of contestants is $y$ . The $y-21$ fishers that caught 3 or more fish caught a total of $x - \left(0(9) + 1(5) + 2(7)\right) = x - 19$ fish. Since they averaged 6 fish, $6 = \frac{x - 19}{y - 21} \Longrightarrow x - 19 = 6y - 126.$ Similarily, those whom caught 12 or fewer fish averaged 5 fish per person, so $5 = \frac{x - (13(5) + 14(2) + 15(1))}{y - 8} = \frac{x - 108}{y - 8} \Longrightarrow x - 108 = 5y - 40.$ Solving the two equation system, we find that $y = 175$ and $x = \boxed{943}$ , the answer.

1993 AIME (Problems • Resources)
Preceded by Problem 2	Followed by Problem 4
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15

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1993 AIME Problems/Problem 3

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Problem

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