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HMMT 二月 2000 · GEN 赛 · 第 3 题

HMMT February 2000 — GEN Round — Problem 3

专题
Discrete Math / 离散数学
难度
L3
来源
HMMT

题目详情

  1. A t w elv e fo ot tree asts a v e fo ot shado w. Ho w long is Henry's shado w (at the same time of da y) if he is v e and a half feet tall?
解析
  1. Let x b e the length of Henry's shado w in feet. Using similar triangles, w e nd that 55 5 : 5 x 5 : 5 11 = , so x = 5 = 5 = . 12 5 12 24 24