We know that for s to have the form D.D0D0, D must be an integer from 1-9. So s could be 1.1010, 2.2020 ... 9.9090. For a statement to be sufficient, we must be able to determine what integer D is.
Statement 1
If D+D is not a single digit, this means that D+D must be greater than or equal to 10, making D greater than or equal to 5. However, D can still be 5, 6, 7, 8, or 9. Insufficient.
Statement 2
If 2s > 10, s > 5. This means that s could be 5.5050, 6.6060, 7.7070, 8.8080, or 9.9090. So Statement 2 tells us the exact same thing as Statement 1. Insufficient.
Both
Since both statements tells us the same thing, putting them together doesn't do us any good. So the correct answer is E.
If s is a decimal of the form D.D0D0, what is s?
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Source: Beat The GMAT — Data Sufficiency |
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