[計量] 兩題數學
One-k th of a circular pie has been served. If the rest of the pie is divided
into n equal servings, then each of these servings is what fraction of the
whole pie?
(A)1/nk (B)(k-n)/nk (C)1/(n-k) (D)(k-1)/nk (E)(k-1)/n
ans:(D)
In a certain country, a perspn is born every 3 seconds and a person dies every
10 seconds. Therefore, the birth and death rates account for a population
growth rate of one person every
(A)10/3sec (B)30/7sec (C)7sec (D)35/3sec (E)13sec
ans:(B)
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