Five years ago, Beth's age was three times that of Amy. Ten years ago, Beth's age was one half that of Chelsea. If C represents Chelsea's current age, which of the following represents Amy's current age?
(A) C/6 + 5
(B) 2 C
(C) (C - 10)/3
(D) 3 C - 5
(E) (5/3) C - 10
[spoiler]Source: https://www.west.net/~stewart/gmat[/spoiler]
half that of Chelsea
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
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
- 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
Please share your views along with all of your IMOs.goyalsau wrote:I think its A.
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
- Scott@TargetTestPrep
- GMAT Instructor
- Posts: 7247
- Joined: Sat Apr 25, 2015 10:56 am
- Location: Los Angeles, CA
- Thanked: 43 times
- Followed by:29 members
Let's let a, b, and c represent the current ages of Amy, Beth, and Chelsea, respectively. We can create the equations:sanju09 wrote:Five years ago, Beth's age was three times that of Amy. Ten years ago, Beth's age was one half that of Chelsea. If C represents Chelsea's current age, which of the following represents Amy's current age?
(A) C/6 + 5
(B) 2 C
(C) (C - 10)/3
(D) 3 C - 5
(E) (5/3) C - 10
b - 5 = 3(a - 5)
b - 5 = 3a - 15
b = 3a - 10
and
b - 10 = (1/2)(c - 10)
2b - 20 = c - 10
2b - 10 = c
Substituting, we have:
2(3a - 10) - 10 = c
6a - 20 - 10 = c
6a - 30 = c
a - 5 = c/6
a = c/6 + 5
Answer: A
Scott Woodbury-Stewart
Founder and CEO
[email protected]
See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews