1.

1). The data in Statement I alone are sufficient to answer the question, while the data in statements II alone are not sufficient to answer the question.2). The data in statement II alone are sufficient to answer the questions, while the data in statement I alone are not sufficient to answer the question.3). The data in both the statements I and II together are necessary to answer the question.4). The data even in both the statements I and II together is not sufficient to answer the question.

Answer»

From statement I:

We only know that Fang will take twice as many days as Wang, but we cannot find the number of days that Zhang will take to complete the work.

From statement II:

TIME taken by Wang to do the whole work ALONE,

⇒ 1/20 - 1/30 = 1/60 = 60 days.

But this statement alone is not sufficient to answer the question.

Combining the two statements:

Fang will take 120 days to complete the work.

⇒ 1/Z + 1/F = 1/30

⇒ 1/Z + 1/120 = 1/30

⇒ 1/Z = 1/30 - 1/120 = (4 - 1)/120 = 3/120 = 1/40

∴ Zhang take 40 days to complete the work, working alone.

∴ Both statements are REQUIRED to answer the question



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