DS Test – 16 - Q7 - The Beat The GMAT Forum - Expert GMAT Help & MBA Admissions Advice

DS Test – 16 - Q7

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f2001290: Master | Next Rank: 500 Posts; Posts: 400; Joined: Sat Mar 10, 2007 4:04 amFollowed by: 1 member; Thanked: 1 times

by f2001290 » Sat May 26, 2007 9:45 am

7. If a certain grove consists of 36 pecan trees, what was the yield per tree last year?
(1) The yield per tree for the 18 trees in the northern half of the grove was 60 kilograms last year.
(2) The yield per tree for the 18 trees in the eastern half of the grove was 55 kilograms last year.

OA is E. But I am surprised. It should be C. Any explanation..

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Source: Beat The GMAT — Data Sufficiency | Sat May 26, 2007 9:45 am

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Wed Jan 15, 2014 10:54 pm

f2001290 wrote:7. If a certain grove consists of 36 pecan trees, what was the yield per tree last year?
(1) The yield per tree for the 18 trees in the northern half of the grove was 60 kilograms last year.
(2) The yield per tree for the 18 trees in the eastern half of the grove was 55 kilograms last year.

OA is E. But I am surprised. It should be C. Any explanation..

Statements have to be taken together without doubt; hence the answer could be C or E. Real trick is this hidden question, "Do the northern and the eastern halves of the grove have any trees COMMON or NOT?" Hence E.

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

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GMAT/MBA Expert

Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Thu Jan 16, 2014 7:16 am

If a certain grove consists of 36 pecan trees, what was the yield per tree last year?
(1) The yield per tree for the 18 trees in the northern half of the grove was 60 kilograms last year.
(2) The yield per tree for the 18 trees in the eastern half of the grove was 55 kilograms last year.

Sanjeev's explanation is perfect. I thought I'd add some images for any students who may prefer a visual explanation.

GOAL: Determine the yield for the ENTIRE grove.

Statement 1 tells us about the shaded trees shown here.

Since there are trees we know nothing about, statement 1 is not sufficient.

Statement 2 tells us about the shaded trees shown here.

Since there are trees we know nothing about, statement 2 is not sufficient.

The statements COMBINED could look something like this.

Since it's still possible that we have no information about some trees, we can't answer the target question with any certainty.

Answer: E

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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