The first-year MBA class at XYZ University is composed...

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BTGmoderatorLU: Moderator; Posts: 2505; Joined: Sun Oct 15, 2017 1:50 pm; Followed by:6 members

The first-year MBA class at XYZ University is composed...

by BTGmoderatorLU » Sat Nov 04, 2017 6:40 am

The first-year MBA class at XYZ University is composed of 60 male students and 40 female students. How many male students from the first-year class are tajing economics?

(1) Fifty percent of the first-year class are taking economics.
(2) 10 female students from the first-year class are not taking economics.

The OA is C.

I don't have clear this DS question. Please, can any expert explain ti for me? Thanks.

Quote

Source: Beat The GMAT — Data Sufficiency | Sat Nov 04, 2017 6:40 am

GMAT/MBA Expert

ErikaPrepScholar: Legendary Member; Posts: 503; Joined: Thu Jul 20, 2017 9:03 am; Thanked: 86 times; Followed by:15 members; GMAT Score:770

by ErikaPrepScholar » Tue Nov 07, 2017 9:24 am

Statement 1

This tells us that 50 students are taking economics. But are all 50 of them male students? Are there 40 female students and 10 male students? Are there 25 of each? We don't know. Insufficient.

Statement 2

This tells us that 30 female students are taking economics. But this doesn't tell us anything about how many male students are taking economics. It could be all of them, none of them, half of them, etc. Insufficient.

Both

If 50 students are taking economics, and 10 of them are female students, 40 male students must be taking economics. Sufficient.