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GMAT question - Is ab/c =1? - Review

Type: Data Sufficiency

Difficulty:

Is $mathematical expression$ ?

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
EACH statement ALONE is sufficient
Statements (1) and (2) TOGETHER are NOT sufficient

Statement (1) tells us nothing about b and therefore is not sufficient to answer the question.

Statement (2) tells us nothing about a and therefore is not sufficient to answer the question.

Since neither statement is sufficient on its own then there are two possible answers, C (Together) or E (Neither).

We need to work out whether both statements together are sufficient to answer the question in order to decide between these options.

Multiplying both statements together gives us

$mathematical expression$

So we know that

$mathematical expression$

However this is not sufficient to answer the question since it is true if $mathematical expression$ and not true if $mathematical expression$ .

Therefore even both statements together are not sufficient to answer the question and the answer is E.

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