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.
Jul 0901:00 PM EDT
-02:00 PM EDT
More Target Test Prep students are earning 100th percentile GMAT scores. Don’t settle for less when the Target Test Prep course gives you everything you need to score high on the GMAT. Start your 5-day free trial today.
Jul 1011:00 AM PDT
-11:00 AM PDT
In our conversation, Kishore talks about how strategically he used data analytics to identify high impact areas to focus on as well as his early morning study routine (3 AM prep!) that optimized his GMAT preparation.- Jun 30
08:00 AM PDT
-11:59 PM PDT
Join us June 30th for 2 weeks of GMAT questions (just 8 per day) to help with your prep and to compete with your fellow GMAT Clubbers for a chance to win a prize fund of $30,000 for you and your team-mates! - Jul 09
11:00 AM PDT
-12:30 PM PDT
Welcome to the M7 MBA Spotlight Series, featuring MIT Sloan School of Management! This video is part of GMAT Club’s exclusive MBA Spotlight event, where top business schools meet prospective applicants like you. 
Jul 1206:30 AM PDT
-08:30 AM PDT
Join our webinar to master GMAT RC Main Point Questions! Learn effective strategies to decipher passage themes and purposes. Senior Verbal Expert- Sunita Singhvi will equip you with tools to navigate complexities and avoid common traps set by the GMAT.
Jul 1211:00 AM IST
-01:00 PM IST
Attend this session to learn how to Deconstruct arguments, Pre-Think Author’s Assumptions, and apply Negation Test.
Jul 1311:00 AM EDT
-12:30 PM EDT
Looking for your GMAT motivation to break through the score plateau? Pragati improved her score by massive 160 points with strategic guidance and hard-work! Find out how personalized mentorship and a strong mindset can turn GMAT struggles into success.
Jul 1508:00 PM PDT
-09:00 PM PDT
Full-length FE mock with insightful analytics, weakness diagnosis, and video explanations!
Jul 1611:00 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.
20 Sep 2018, 08:32
Kudos
Bookmarks
C
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:
91% (01:28) correct
9%
(02:09)
wrong
based on 566
sessions
History
Date
Time
Result
Not Attempted Yet
Today, Anna is 10 years older than Michelle. If fifteen years ago, Anna was twice as old as Michelle, how old is Michelle today?
a) 20
b) 22
c) 25
d) 28
e) 30
source gmat tutor
a) 20
b) 22
c) 25
d) 28
e) 30
source gmat tutor
Updated on: 15 Apr 2022, 16:06
Originally posted by BrentGMATPrepNow on 20 Sep 2018, 08:46.
Last edited by BrentGMATPrepNow on 15 Apr 2022, 16:06, edited 1 time in total.
Last edited by BrentGMATPrepNow on 15 Apr 2022, 16:06, edited 1 time in total.
Kudos
Bookmarks
bettatantalo
Today, Anna is 10 years older than Michelle. If fifteen years ago, Anna was twice as old as Michelle, how old is Michelle today?
a) 20
b) 22
c) 25
d) 28
e) 30
a) 20
b) 22
c) 25
d) 28
e) 30
STRATEGY: Upon reading any GMAT Problem Solving question, we should always ask, Can I use the answer choices to my advantage?
In this case, we can easily test the answer choices.
Now let's give ourselves up to 20 seconds to identify a faster approach.
In this case, we can also solve the question algebraically.
I think testing the answer choices will be faster and less prone to errors. So let's test the answer choices.
It's typically best to start with choice C, the middle value, since we can often eliminate answer choices after testing that value.
C) 25
If Michelle is 25 years old TODAY, then Anna is 35 years old TODAY (since she's 10 years older than Michelle)
So, 15 YEARS AGO, Michelle was 10 years old and Anna was 20 years old
This meets the given condition that Anna was twice as old as Michelle 15 YEARS AGO
Answer: C
Plan B: The conventional (i.e., high school math) approach
Let M = Michelle's PRESENT age
So, M + 10 = Anna's PRESENT age (since she's 10 years older than Michelle)
This means M - 15 = Michelle's age 15 YEARS AGO
And (M + 10) - 15 = Anna's age 15 YEARS AGO
In other words, M - 5 = Anna's age 15 YEARS AGO
Given: fifteen years ago, Anna was twice as old as Michelle
So, we can write: M - 5 = 2(M - 15)
Expand the right side: M - 5 = 2M - 30
Add 30 both sides of the equation: M + 25 = 2M
Subtract M from both sides of the equation: 25 = M
Answer: C
General Discussion
20 Sep 2018, 08:36
Kudos
Bookmarks
bettatantalo
Today, Anna is 10 years older than Michelle. If fifteen years ago, Anna was twice as old as Michelle, how old is Michelle today?
a) 20
b) 22
c) 25
d) 28
e) 30
source gmat tutor
A = 10 + M--------------------------------->(I)a) 20
b) 22
c) 25
d) 28
e) 30
source gmat tutor
A - 15 = 2(M - 15)------------------------->(II)
Substitute the value of A
10 + M - 15 = 2M - 30
M = 40 - 15
Thus, Michelle is 25 Years now, answer must be (C)
