Mo2men wrote:

Dear

GMATGuruNYCan you help with this question? From OA, it is assumed that the festival connected on both days, while the wording, for me at least, may suggest only it is 2 days festival?

A music festival took place over two days, Saturday and Sunday.This wording conveys that the festival lasted exactly two days (Saturday and Sunday).

**Quote:**

How can I infer that someone who attended on Sunday must have attended on Saturday?k

The prompt does not indicate that anyone who attended Sunday must also have attended Saturday.

Before we examine the statements, we know only the following:

Anyone who attended the festival must have attended only Saturday, only Sunday, or both days.

Let the total number of attendees = 100.

Statement 1: 40% of attendees attended both days.

No way to determine how many attendees attended only Saturday.

INSUFFICIENT.

Statement 2: 70% of attendees attended on Sunday.

Since 70 of the 100 attendees attended Sunday, the remaining 30 did NOT attend Sunday and thus must have attended only Saturday.

SUFFICIENT.

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