Re: [計量] 請教一題
※ 引述《yauu (真無雙亂舞)》之銘言:
: In a certain country, a person is born every 3 seconds and a person
: dies every 10 seconds. Therefore, the born and death rates account for
: a population growth rate of one person every
: (A) 3 and 1/3 sec
: (B) 4 and 2/7 sec
: (C) 7 sec
: (D) 11 and 2/3 sec
: (E) 13 sec
: ANS: (B)
: 題目看不太懂 先謝謝大家了
這題剛好美加-江樸老師上過,根據提意可以得知,
30秒後,會有10人出生,3個人死亡,
得一結論: 30秒會有7個人出生
30/7= (B) 4 and 2/7 sec
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