2022 AMC 8 Problem 6

Attempt Problem 6 of the 2022 AMC 8 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 2022 AMC 8 solutions, or check the answer key.

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

6.

Three positive integers are equally spaced on a number line. The middle number is 1515 and the largest number is 44 times the smallest number. What is the smallest of these three numbers?
44
55
66
77
88
Answer: C
Concepts:arithmetic sequencelinear equation
Small hint:
The middle of three equally spaced numbers is their average
Big hint:
If the smallest is xx, then the largest is 4x4x
Solution:
Let the smallest number be xx. Then the largest is 4x4x. Since the three numbers are equally spaced, the middle number is the average of the smallest and largest: x+4x2=15. \frac{x+4x}{2}=15. Thus 5x=305x=30, so x=6x=6.
Thus, the correct answer is C.
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