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Bunuel
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GMAT 1: 740 Q51 V39
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We know that for every scarf bought at regular price (\(p\)), one additional scarf was bought at half the regular price (\(\frac{p}{2}\)).

Therefore, the total price of 2 scarves is: \(p+\frac{p}{2}=\frac{3p}{2} \)

Let \(s\) be the number of pairs of scarves purchased by the theatre. Then, the total amount spent is: \(tot=\frac{3p}{2}*s\)


Statement 1: The regular price of each scarf was $18.

This statement gives us \(p\), so: \(tot=\frac{3*18}{2}*s\) --> \(tot=27*s\)

However, we do not know \(tot\), so we cannot determine \(s\) (and therefore cannot determine the total number of scarves).

Not sufficient


Statement 2: The theater spent $216 on the scarves.

This statement gives us \(tot\), so we have: \(216=\frac{3*p}{2}*s\)

We do not know \(p\), so there are still two unknowns (\(p\) and \(s\)). Therefore, we cannot determine the number of scarves.

Not sufficient


Statement 1 + Statement 2

Now we know both \(p \) and \(tot\): \(216=\frac{3*18}{2}*s\)

The only unknown variable now is \(s\), so we can determine its value and therefore determine the total number of scarves.

Tip: It is not necessary to calculate \(s\). For Data Sufficiency, it is enough to show that \(s\) can be determined uniquely.

Sufficient


Answer: C
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