AMC 8 1998 Problem 11

AMC8 1998 年第 11 题

逻辑推理（跨域）★★★☆☆

Harry has 3 sisters and 5 brothers. His sister Harriet has

\text{S}

sisters and

\text{B}

brothers. What is the product of

\text{S}

and

\text{B}

Harry 有 3 个姐妹和 5 个兄弟。他的姐妹 Harriet 有

\text{S}

个姐妹和

\text{B}

个兄弟。

\text{S}

和

\text{B}

的乘积是多少？

正确答案 · Correct Answer

解析 · Solution

Solution 1

Harry has 3 sisters and 5 brothers. His sister, being a girl, would have 1 less sister and 1 more brother.

S = 3-1=2B = 5+1=6

S\cdot B = 2×6=12=C

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