A case study on two friends Sarah and Christie revealed that c years ago Sarah was half as old as what Christie will be in s years from now. The study also revealed that s years ago Sarah was 2 fewer than half as old as what Christie will be in c years from now. If Christie's present age is 36, what is the value of s - c?
A. 2
B. 4
C. 5
D. 7
E. It cannot be determined from the information given
[spoiler]Made Up!
Answer: B. 4[/spoiler]
case study on two friends
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
Timer
00:00
Your Answer
A
B
C
D
E
Global Stats
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
-
- Master | Next Rank: 500 Posts
- Posts: 363
- Joined: Sun Oct 17, 2010 3:24 pm
- Thanked: 115 times
- Followed by:3 members
Sa = Sarah and Ch = Christiesanju09 wrote:A case study on two friends Sarah and Christie revealed that c years ago Sarah was half as old as what Christie will be in s years from now. The study also revealed that s years ago Sarah was 2 fewer than half as old as what Christie will be in c years from now. If Christie's present age is 36, what is the value of s - c?
A. 2
B. 4
C. 5
D. 7
E. It cannot be determined from the information given
[spoiler]Made Up!
Answer: B. 4[/spoiler]
Sa-c = 0.5(Ch+s) ->equation1
Sa-s = 0.5(Ch+c)-2 ->equation 2
equation1 - equation 2
-c-(-s)= 0.5s - 0.5c +2
-c+s = 0.5s - 0.5c +2
-c + 0.5c + s - 0.5s = 2
-0.5c + 0.5s = 2
-c + s = 4
s - c = 4
ans = b