Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Apr 2711:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
26 Apr 2019, 07:21
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
92% (00:49) correct
8%
(01:02)
wrong
based on 840
sessions
History
Date
Time
Result
Not Attempted Yet
How old is Jane?
(1) Ten years ago she was one-third as old as she is now.
(2) In 15 years, she will be twice as old as she is now.
ID: 700125
DS89502.01
(1) Ten years ago she was one-third as old as she is now.
(2) In 15 years, she will be twice as old as she is now.
ID: 700125
DS89502.01
Every tricky question should trigger a follow up quiz.
Build that habit with
GMAT Club Forum Quiz →.
26 Apr 2019, 13:06
Kudos
Bookmarks
Bunuel
Target question: How old is Jane?
Statement 1: Ten years ago she was one-third as old as she is now.
Let x = Jane's PRESENT age
So, x - 10 = Jane's age TEN YEARS AGO
We can write: x - 10 = x/3
Multiply both sides by 3 to get: 3x - 30 = x
Subtract 3x from both sides: -30 = -2x
Solve: x = 15
The answer to the target question is Jane is 15 years old
Since we can answer the target question with certainty, statement 1 is SUFFICIENT
Statement 2: In 15 years, she will be twice as old as she is now
Let x = Jane's PRESENT age
So, x + 15 = Jane's age FIFTEEN YEARS FROM NOW
We can write: 2x = x + 15
Subtract x from both sides: x = 15
The answer to the target question is Jane is 15 years old
Since we can answer the target question with certainty, statement 2 is SUFFICIENT
Answer: D
Cheers,
Brent
23 May 2019, 07:34
Kudos
Bookmarks
Solution
Steps 1 & 2: Understand Question and Draw Inferences
We need to find the age of Jane.
- • Let us assume that the present age of Jane is x years.
Hence, we need to find the value of x.
As we do not have any relevant information to infer from, let us now analyse the individual statements.
Step 3: Analyse Statement 1
“Ten years ago, she was one-third as old as she is now.”
- • Age of Jane ten years ago = (Present age of Jane)/3
• Ten years ago, the age of Jane was = x – 10 years.
Hence, x – 10 = x/3
- 3x – 30 = x
From this equation, we can easily find the value of x.
Thus, statement 1 is sufficient to answer the question.
Step 4: Analyse Statement 2
“In 15 years, she will be twice as old as she is now.”
- • Age of Jane 15 years after Now = 2 × Present age of Jane
• After 15 years, age of Jane will be = x + 15
x + 15 = 2x
From this equation, we can easily find the value of x.
Thus, statement 2 is sufficient to answer the question.
Step 5: Combine Both Statements Together (If Needed)
Since we could determine the answer from either of the statements individually, this step is not required.
Hence, the correct answer is option D.
