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..
5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILS
DS Test – 16 - Q7
This topic has expert replies
-
sanju09
- GMAT Instructor
- Posts: 3650
- Joined: Wed Jan 21, 2009 4:27 am
- Location: India
- Thanked: 267 times
- Followed by:80 members
- GMAT Score:760
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.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..
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
Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001
www.manyagroup.com
GMAT/MBA Expert
-
Brent@GMATPrepNow
- GMAT Instructor
- Posts: 16207
- Joined: Mon Dec 08, 2008 6:26 pm
- Location: Vancouver, BC
- Thanked: 5254 times
- Followed by:1268 members
- GMAT Score:770
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
(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
