Is z > 0.5?

[M7MBA]

Is z > 0.5 ?

(1) The tenths digit in the decimal representation of z is greater than 2.
(2) z is between 0 and 1.

[spoiler]OA=E[/spoiler]

Source: GMAT Prep

[Brent@GMATPrepNow]

Is z > 0.5 ?

(1) The tenths digit in the decimal representation of z is greater than 2.
(2) z is between 0 and 1.

Target question: Is z > 0.5 ?
SCAN the statements to see we can jump straight to....


Statements 1 and 2 combined
There are infinitely-many values of z that satisfy BOTH statements. . Here are two:
Case a: z = 0.6. In this case, the answer to the target question is YES, z IS greater than 0.5
Case b: z = 0.3. In this case, the answer to the target question is NO, z is NOT greater than 0.5
Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT

Answer: E

Cheers,
Brent