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06 Mar 2020, 04:11
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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:
92% (00:43) correct
8%
(00:31)
wrong
based on 123
sessions
History
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Time
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Not Attempted Yet
If Farai is twice as old as Dmitry, how old is Farai?
(1) Samantha is 4 years younger than Dmitry.
(2) Samantha will be 11 years old in 5 years.
(1) Samantha is 4 years younger than Dmitry.
(2) Samantha will be 11 years old in 5 years.
06 Mar 2020, 04:31
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Bunuel
F = 2D
Question: F = ?
Statement 1: Samantha is 4 years younger than Dmitry
S = D - 4
No relation between F and D hence
NOT SUFFICIENT
Statement 2: Samantha will be 11 years old in 5 years
S+5 = 11
S = 6
No relation between F and D hence
NOT SUFFICIENT
Combining the statement s
S = 6 and S = D - 4
i.e. D = 10
i.e. F = 20
SUFFICIENT
Answer: Option C
02 Aug 2021, 07:52
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Bunuel
Given: Farai is twice as old as Dmitry
Let D = Dmitry's PRESENT AGE
Let F = Farai's PRESENT AGE
So, we can write: F = 2D
Target question: How old is Farai?
Statement 1: Samantha is 4 years younger than Dmitry.
Let S = Samantha's PRESENT AGE
We can write: S = D - 4
We now have the following:
F = 2D
S = D - 4
We have a system of 2 equations and 3 variables.
In order to solve a system with 3 variables, we need at least 3 different linear equations.
Since we only have two equations, we can be certain that statement 1 is NOT SUFFICIENT
Statement 2: Samantha will be 11 years old in 5 years.
This statement is indirectly telling us that Samantha is PRESENTLY 6 years old.
In other words S = 6
We now have the following:
F = 2D
S = 6
Once again, we have a system of 2 equations and 3 variables.
Since we only have two equations, we can be certain that statement 2 is NOT SUFFICIENT
Statements 1 and 2 combined
When we combine the two statements we have:
F = 2D
S = D - 4
S = 6
Since we have 3 different linear equations and 3 variables, we CAN/COULD solve the system for F, D and S (although we would never waste valuable time on test day doing so).
The combined statements are SUFFICIENT
Answer: C
Cheers,
Brent
