GRE Prep 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.
Exactly 8 years ago, Jim’s son was twice as old as Jim’s
[#permalink]
17 Oct 2017, 22:25
17 Oct 2017, 22:25
00:00
Question Stats:
73% (01:19) correct
26% (02:25) wrong based on 15 sessions
Hide Show timer Statistics
Exactly 8 years ago, Jim’s son was twice as old as Jim’s daughter. If Jim’s son is now 5 years older than his daughter, how old is Jim’s daughter now?
(A) 5
(B) 10
(C) 13
(D) 16
(E) 18
Kudos for correct solution.
(A) 5
(B) 10
(C) 13
(D) 16
(E) 18
Kudos for correct solution.
Re: Exactly 8 years ago, Jim’s son was twice as old as Jim’s
[#permalink]
18 Oct 2017, 05:15
18 Oct 2017, 05:15
1
Calling S son's age and D daughter's age, we get
\(S-8 = 2(D-8)\)
\(S = D+5\)
Solving, D = 13. Answer C
\(S-8 = 2(D-8)\)
\(S = D+5\)
Solving, D = 13. Answer C
Target Test Prep Representative
Joined: 09 May 2016
Status:Head GRE Instructor
Affiliations: Target Test Prep
Posts: 183
Given Kudos: 114
Location: United States
Re: Exactly 8 years ago, Jim’s son was twice as old as Jim’s
[#permalink]
08 Jan 2018, 10:51
08 Jan 2018, 10:51
Expert Reply
Bunuel wrote:
Exactly 8 years ago, Jim’s son was twice as old as Jim’s daughter. If Jim’s son is now 5 years older than his daughter, how old is Jim’s daughter now?
(A) 5
(B) 10
(C) 13
(D) 16
(E) 18
(A) 5
(B) 10
(C) 13
(D) 16
(E) 18
We can let Jim’s son’s current age = s and Jim’s daughter’s current age = d. We can also state that 8 years ago, his son was (s - 8) years old and his daughter was (d - 8) years old. We can create the following equation:
s - 8 = 2(d - 8)
s - 8 = 2d - 16
s = 2d - 8
and
s = 5 + d
Thus:
2d - 8 = 5 + d
d = 13
Answer: C
