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【OG20-P283-350题】
Is the sum of the prices of the 3 books that Shana bought less than $48?(1)The price of the most expensive of the 3 books that Shana bought is less than $17.(2)The price of the least expensive of the 3 books that Shana bought is exactly $3 less than the price of the second most expensive book.
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分析A选项
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分析B选项
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分析C选项
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分析D选项
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分析E选项
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- 网友解析
我有更好的解析 
暂无雷哥网文字解析
设三个价格：a≤b≤c
条件1：17*3=51>48，c<17，不充分
条件2：a+3=b，不充分
结合：b≤c<17，a<14，a+b+c<14+17+17=48，充分
题目讨论 （7条评论）
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499685skw
明明就是两个条件放在一起算的但却选了B，对自己无语了
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2022-09-05 15:13:46
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700+冲冲冲！！！
这网友解析在瞎搞吧
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2020-07-10 16:13:18
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梦sir
Target question: Is the sum of the prices of the 3 books less than $48 ? Let A = price of the LEAST expensive book (in dollars) Let B = price of the mid-priced expensive book (in dollars) Let C = price of the MOST expensive book (in dollars) So, A < B < C Statement 1: The price of the most expensive of the 3 books that Shana bought is less than $17. So, C < 17 Let's TEST some values. There are several cases that satisfy statement 1. Here are two: Case a: A = $1, B = $2 and C = $3, in which case A + B + C = 1 + 2 + 3 = 6. In this case, the answer to the target question is YES, the sum of the prices IS less than $48 Case b: A = $16.25, B = $16.50 and C = $16.75, in which case A + B + C = 16.25 + 16.50 + 16.75 = 49.50. In this case, the answer to the target question is NO, the sum of the prices is NOT less than $48 Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT Statement 2: The price of the least expensive of the 3 books that Shana bought is exactly $3 less than the price of the second most expensive book. In other words, A = B - 3 Let's TEST some values again. There are several cases that satisfy statement 1. Here are two: Case a: A = $1, B = $4 and C = $10, in which case A + B + C = 1 + 4 + 10 = 15. In this case, the answer to the target question is YES, the sum of the prices IS less than $48 Case b: A = $1, B = $4 and C = $100, in which case A + B + C = 1 + 4 + 100 = 105. In this case, the answer to the target question is NO, the sum of the prices is NOT less than $48 Since we cannot answer the target question with certainty, statement 2 is NOT SUFFICIENT Statements 1 and 2 combined Statement 1 tells us that C < 17 Statement 2 tells us that A = B - 3 Let's MAXIMIZE ALL of the values If C < $17, then the greatest possible value of C = $16.99 Since B must be less than C, the greatest possible value of B = $16.98 Since A is $3 less than B, greatest possible value of A = $12.98 So, when we MAXIMIZE all 3 values, A + B + C = $16.99 + $16.98 + $12.98 = $46.95, which is less than $48 If if the GREATEST values of A, B and C have a sum that's less than $48, we can conclude that is must be the case that A + B + C < 48 In other words, the answer to the target question is YES, the sum of the prices IS less than $48 Since we can answer the target question with certainty, the combined statements are SUFFICIENT Answer: C
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2020-03-13 16:23:57
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Zzzzs
不是只要可以回答是yes 还是no 就行了吗？ 难道还要一定可以确定是yes才能是sufficient的吗？
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2019-03-19 17:08:01
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534957vn回复 Zzzzs
能确定是yes还是no就行，不一定得是yes
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2022-05-26 19:32:00
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乔治8198
没想到price可以有小数
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2018-12-13 21:32:13
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kadxz555回复乔治8198
是的！没想到鸭！
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2019-06-05 05:01:51
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Jacee
（1）三本书如果都是16.5，加总大于48；如果都是15，加总小于48,；所以不能确定，（1）单独不行。
（2）只知道两本书的关系，第三本价格可以任意，（2）单独不行。
（1）+（2）假设总价48，当最贵的一本书17时，设最便宜一本x，中间的x+3，解得分别是14、17；当最贵一本低于17（条件1）时，中间那本将大于17，从而不是中间贵的了，因此总价格必定小于48，有确定解。
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2018-08-23 11:05:30
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lxra
price 可以取小数！！不一定是整数
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2018-07-10 18:43:28
