GMAT Problem Solving
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Source: OG13th
Level: 5
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, £, 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 E - S ?
I.-16
II.6
III.10
- A I only
- B I and II only
- C I and III only
- D II and III only
- E I,II, and III