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29 Sep 2015, 21:25
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
81% (01:28) correct
19%
(01:07)
wrong
based on 128
sessions
History
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How many years old will Fred be y years from now?
(1) Doris is 12 years older than Fred.
(2) The sum of the ages of Doris and Fred is y years.
Kudos for a correct solution.
(1) Doris is 12 years older than Fred.
(2) The sum of the ages of Doris and Fred is y years.
Kudos for a correct solution.
camlan1990
Joined: 11 Sep 2013
Last visit: 19 Sep 2016
Posts: 96
Given Kudos: 26
Schools: Kenan-Flagler '17 SMU '17 McCombs '19
30 Sep 2015, 10:43
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[quote="Bunuel"]How many years old will Fred be y years from now?
(1) Doris is 12 years older than Fred.
(2) The sum of the ages of Doris and Fred is y years.
Kudos for a correct solution.[/
Age of Fred now = F
Need to determine F + y
(1) Doris is 12 years older than Fred.
=> D = F+12
=> Cannot know F+y => INSUF
(2) The sum of the ages of Doris and Fred is y years.
=> D + F = y => Cannot not F+y => INSUF
(1)+(2): F+F+12= y
=> INSUFFICIENT
=> Ans: E
(1) Doris is 12 years older than Fred.
(2) The sum of the ages of Doris and Fred is y years.
Kudos for a correct solution.[/
Age of Fred now = F
Need to determine F + y
(1) Doris is 12 years older than Fred.
=> D = F+12
=> Cannot know F+y => INSUF
(2) The sum of the ages of Doris and Fred is y years.
=> D + F = y => Cannot not F+y => INSUF
(1)+(2): F+F+12= y
=> INSUFFICIENT
=> Ans: E
05 Oct 2015, 05:41
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Bunuel
How many years old will Fred be y years from now?
(1) Doris is 12 years older than Fred.
(2) The sum of the ages of Doris and Fred is y years.
Kudos for a correct solution.
(1) Doris is 12 years older than Fred.
(2) The sum of the ages of Doris and Fred is y years.
Kudos for a correct solution.
VERITAS PREP OFFICIAL SOLUTION:
Question Type: What Is the Value? This question asks how old Fred will be in y years.
Given information from the question stem: This question is asking for a specific number for the age that Fred will be y years from now. You can represent that as F + y.
Statement 1: Doris is 12 years older than Fred can be written “F + 12 = D.” This is clearly not sufficient to determine Fred’s age now or in the future. Eliminate
choices A and D.
Statement 2: The sum of the ages of Doris and Fred is y years can be written “F + D = y.” This statement only consists of three variables without any actual numbers, so it cannot give us a specific age for Doris or for Fred. This is not sufficient, so eliminate choice B.
Together: If you take both statements together you can use the second equation “F+D = y” and substitute “F+12” for D. This yields the equation “F + F + 12 = y.” Without knowing either what y is or what F is this equation cannot be solved, as it is one equation with two variables.
The answer is E.
