AMC 8 1989 Problem 6

AMC8 1989 年第 6 题

数列与规律★★☆☆☆

If the markings on the number line are equally spaced, what is the number

y

?

如果数轴上的标记是等间距的，数

y

是多少？

AMC 8 1989 Problem 6 figure

A.3
B.10
C.12
D.15
E.16

正确答案 · Correct Answer

C

解析 · Solution

Solution 1

Since there are 5 gaps between 0 and 20, each gap has length

\displaystyle \frac{20}{5} = 4

.

Since there are 3 gaps between 0 and

y

, y=0 + 3×4=12.

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