Problem Solving

试题详情

题目:

List T consists of 30 positive decimals, none of which is an integer, and the sum of the 30 decimals is S. The estimated sum of the 30 decimals, E, is defined as follows. Each decimal in T whose tenths digit is even is rounded up to the nearest integer, and each decimal in T whose tenths digit is odd is rounded down to the nearest integer; E is the sum of the resulting integers. If of the decimals in T have a tenths digit that is even, which of the following is a possible value of ES?

选项:

A、I only
B、I and II only
C、I and III only
D、II and III only
E、I, II, and III

答案:

B

提问:

没看懂题,OG后面解析也没有看懂!
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