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Today Rose is twice as old as Sam and Sam is 3 years younger

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Today Rose is twice as old as Sam and Sam is 3 years younger [#permalink]

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New post 16 Apr 2006, 19:38
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This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Today Rose is twice as old as Sam and Sam is 3 years younger than Tina. If Rose, Sam, and Tina are all alive 4 years from today, which of the following must be true on that day?

I. Rose is twice as old as Sam.
II. Sam is 3 years younger than Tina.
III. Rose is older than Tina.

OPEN DISCUSSION OF THIS QUESTION IS HERE: https://gmatclub.com/forum/today-rose-i ... 31477.html

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Re: Today Rose is twice as old as Sam and Sam is 3 years younger [#permalink]

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New post 16 Apr 2006, 22:14
Another vote for II.

The differnce in ages remain the same even if you roll back or advance the time frame.
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Re: Today Rose is twice as old as Sam and Sam is 3 years younger [#permalink]

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New post 17 Apr 2006, 10:42
II it is! :wink:

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Re: Today Rose is twice as old as Sam and Sam is 3 years younger [#permalink]

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New post 17 Apr 2006, 14:36
The answer will be both II and III

III because - lets say that sam is 5 yrs today; rose must be 10 yr today with tina's current age being 8 yrs. 4 yrs down their ages will be sam 9, rose 14 and tina 12. therefore rose will be oldeer than tina (as she is today).

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Re: Today Rose is twice as old as Sam and Sam is 3 years younger [#permalink]

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New post 17 Apr 2006, 15:24
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But III wont' work if Sam is 2 years old now.

Now
S=2
R=4
T=5

+4 years
S= 6
R=8
T=9
T<R

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Re: Today Rose is twice as old as Sam and Sam is 3 years younger [#permalink]

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New post 30 Jul 2017, 20:50
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Re: Today Rose is twice as old as Sam and Sam is 3 years younger [#permalink]

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New post 30 Jul 2017, 21:11
Matador wrote:
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Today Rose is twice as old as Sam and Sam is 3 years younger than Tina. If Rose, Sam, and Tina are all alive 4 years from today, which of the following must be true on that day?

I. Rose is twice as old as Sam.
II. Sam is 3 years younger than Tina.
III. Rose is older than Tina.

OPEN DISCUSSION OF THIS QUESTION IS HERE: https://gmatclub.com/forum/today-rose-i ... 31477.html



Notice that we are asked which of the following MUST be true not COULD be true.

Stem says that "Sam is 3 years younger than Tina" which naturally be exactly so ANY number of years from today. So, II is always true. Which means that the answer is B (II only), D (I and II only) or E (II and III only).

Analyze options I and III
I. Rose is twice as old as Sam.
III. Rose is older than Tina

Now, if today Rose is 4 years old, Sam is 2 years old and Tina is 5 years old then after 4 years Rose will be 8 years old, Sam is will be 6 years old and Tina will be 9 years old, so neither option I nor option III holds true.

Answer: B (II only).

OPEN DISCUSSION OF THIS QUESTION IS HERE: https://gmatclub.com/forum/today-rose-i ... 31477.html
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Re: Today Rose is twice as old as Sam and Sam is 3 years younger   [#permalink] 30 Jul 2017, 21:11
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