【OG20-P286-383题】For a certain city’s library, the average cost of _OG18新题

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【OG20-P286-383题】

For a certain city’s library, the average cost of purchasing each new book is $28. The library receives $15,000 from the city each year; the library also receives a bonus of $2,000 if the total number of items checked out over the course of the year exceeds 5,000. Did the library receive the bonus last year?

(1) The library purchased an average of 50 new books each month last year and received enough money from the city to cover this cost.

(2) The lowest number of items checked out in one month was 459.

A

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
分析A选项
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B

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
分析B选项
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C

BOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
分析C选项
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D

EACH statement ALONE is sufficient.
分析D选项
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E

Statements (1) and (2) TOGETHER are NOT sufficient.
分析E选项
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题目讨论（6条评论）

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骆驼去美国

这道题很tricky

0 0 回复 2020-02-07 13:46:51
1289311ww

the total number of items checked out这话是什么意思是指书的数量还是书的总成本

0 0 回复 2019-12-27 16:15:13
249951pp

(1) 15000$/12 = 1250$ 1250/28 = 44.64 items<50 items (15000+2000)/12 = 1416.67$ 1416.67/28 = 50.59>50 items ∴library只有在收到bonus的情况下才可能cover the cost of purchasing new books (2) 459*12 = 5508 items > 5000 ∴sufficient

2 0 回复 2019-09-12 16:46:50
Serenity

(1) 15000$/12 = 1250$ 1250/28 = 44.64 items<50 items (15000+2000)/12 = 1416.67$ 1416.67/28 = 50.59>50 items ∴library只有在收到bonus的情况下才可能cover the cost of purchasing new books (2) 459*12 = 5508 items > 5000 ∴sufficient

0 0 回复 2018-09-28 03:55:26
开灰机的舒克

条件2通过计算12乘以459大于5000可知充分，关键是条件1为何充分？每个月平均50本，所以一年下来花费16800已经超出15000，而题干说得到了足够的钱去覆盖成本，说明2000元奖励是拿到手了

0 0 回复 2018-08-19 22:05:47
阿伦春希

条件2通过计算12乘以459大于5000可知充分，关键是条件1为何充分？每个月平均50本，所以一年下来花费16800已经超出15000，而题干说得到了足够的钱去覆盖成本，说明2000元奖励是拿到手了

0 0 回复 2018-08-08 14:52:51