以下是引用charmant在2005-4-21 22:27:00的发言:检查一批罐头。1.5%不合格。在所有不合格的罐头里面,有5/6是贴错标签的,剩下的是罐子凹陷进去的。如果贴错标签或者凹罐都算不合格,问昨天有多少凹罐? (1) 昨天有450个不合格的。所以有1/6是凹罐的就是75罐,可以 (2)检查了29,500个罐头。29500*1.5%*1/6,也可以 D?? Agree with LS on the answer, but not the calculation on (2). Basically, the question is: can we find the TOTAL numbers of cans inspected. 1) 450/(1.5%)=30,000; so there are a total of 30,000 cans; then find the number of dented (30,000*1.5%*1/6) 2) 29,500=(1-1.5%)=30,000; same as statement one. Two statements are telling us the same thing. So D. Hope it's correct. |