2023 AIME II Problem 1

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Concepts:arithmetic sequencelinear equation

Difficulty rating: 1890

1.

The numbers of apples growing on each of six apple trees form an arithmetic sequence where the greatest number of apples growing on any of the six trees is double the least number of apples growing on any of the six trees. The total number of apples growing on all six trees is 990.990. Find the greatest number of apples growing on any of the six trees.

Solution:

Let the six counts be a,a+d,,a+5da, a+d, \ldots, a+5d with common difference d0.d \ge 0. The greatest count is double the least, so a+5d=2a,a + 5d = 2a, which gives a=5d.a = 5d. The total is 6a+15d=30d+15d=45d=990,6a + 15d = 30d + 15d = 45d = 990, so d=22.d = 22.

The greatest number of apples is a+5d=10d=220.a + 5d = 10d = 220.

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