How many of the 400 students in the 11th grade will take

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BTGmoderatorLU: Moderator; Posts: 2547; Joined: Sun Oct 15, 2017 1:50 pmFollowed by: 6 members

by BTGmoderatorLU » Sat Dec 07, 2019 8:46 am

Source: Princeton Review

How many of the 400 students in the 11th grade will take calculus?

1) 40 % of the students at the school take calculus.
2) 80% of the 11th graders do not take calculus.

The OA is B

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Source: Beat The GMAT — Data Sufficiency | Sat Dec 07, 2019 8:46 am

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Jay@ManhattanReview: GMAT Instructor; Posts: 3008; Joined: Mon Aug 22, 2016 6:19 amFollowed by: 34 members; Location: Grand Central / New York; Thanked: 470 times

by Jay@ManhattanReview » Thu Dec 12, 2019 10:45 pm

BTGmoderatorLU wrote:Source: Princeton Review

How many of the 400 students in the 11th grade will take calculus?

1) 40 % of the students at the school take calculus.
2) 80% of the 11th graders do not take calculus.

The OA is B

Let's take each statement one by one.

1) 40% of the students at the school take calculus.

This statement does not help as it talks about the school and not about 11th-grade students. Insufficient

2) 80% of the 11th graders do not take calculus.

=> 20% of the 11th graders will take calculus. Or, 20% of 400 = 80 students of 11th grade will take calculus. Sufficient.

The correct answer: B

Hope this helps!

-Jay
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