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Math Expert V
Joined: 02 Sep 2009
Posts: 58320
Five years ago, Juliet was three times as old as Will. If Juliet is  [#permalink]

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Difficulty:   15% (low)

Question Stats: 90% (01:05) correct 10% (01:27) wrong based on 56 sessions

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Five years ago, Juliet was three times as old as Will. If Juliet is currently twice as old as Will, how old is Juliet?

A. -10
B. 10
C. 15
D. 20
E. 25

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Director  V
Joined: 04 Dec 2015
Posts: 745
Location: India
Concentration: Technology, Strategy
WE: Information Technology (Consulting)
Re: Five years ago, Juliet was three times as old as Will. If Juliet is  [#permalink]

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Bunuel wrote:
Five years ago, Juliet was three times as old as Will. If Juliet is currently twice as old as Will, how old is Juliet?

A. -10
B. 10
C. 15
D. 20
E. 25

Let Will's and Juliet's age represented as W and J respectively.
Given currently Juliet is twice as old as Will. Therefore; $$J = 2W$$

Five years ago, Juliet was three times as old as Will. Therefore;
$$J - 5 = 3(W - 5)$$
$$2W - 5 = 3W - 15$$ ------------- (Substituting $$J = 2W$$)
$$3W - 2W = 15 - 5$$
$$W = 10$$

Therefore Will's current age is 10 years.
Juliet's current age = $$2W = 20$$ years. Answer D...
Manager  B
Joined: 03 Feb 2017
Posts: 73
Location: Australia
GMAT 1: 720 Q48 V40 Five years ago, Juliet was three times as old as Will. If Juliet is  [#permalink]

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Given W=J/2; and J-5=3*(W-5)

From here, using answer choices, we can work backward (I find that I do not make many silly calculation mistakes this way)

From answer choice D => J=20, so W=10, and W-5=5, J-5=15, which is indeed 3*(W-5).

For other answer choices we do not get J-5=3*(W-5)
Hence D
Manager  B
Joined: 27 Mar 2016
Posts: 110
Re: Five years ago, Juliet was three times as old as Will. If Juliet is  [#permalink]

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J-5=3*(w-5)
J=2w
2w-5=3w-15
w=10
J=20
Hence answer should be D

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Target Test Prep Representative D
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Re: Five years ago, Juliet was three times as old as Will. If Juliet is  [#permalink]

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Bunuel wrote:
Five years ago, Juliet was three times as old as Will. If Juliet is currently twice as old as Will, how old is Juliet?

A. -10
B. 10
C. 15
D. 20
E. 25

We can let Juliet’s current age = J and Will’s current age = W.

Since five years ago Juliet was three times as old as Will:

J - 5 = 3(W - 5)

J - 5 = 3W - 15

J = 3W - 10

Since Juliet is currently twice as old as Will:

J = 2W

We can substitute 2W for J in our first equation and we have:

2W = 3W - 10

10 = W

Since W = 10, J = 2(10) = 20.

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Intern  B
Joined: 28 Dec 2017
Posts: 30
Re: Five years ago, Juliet was three times as old as Will. If Juliet is  [#permalink]

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Five years ago:
J - 5 = 3(W - 5)
J - 5 = 3W - 15 Equation 1

Currently:
J = 2W
W = J/2 Equation 2

Substitute Equation 2 into Equation 1:
J - 5 = 3*(J/2) - 15
10 = (1/2)*J
J = 20 (Answer D) Re: Five years ago, Juliet was three times as old as Will. If Juliet is   [#permalink] 20 Jan 2018, 22:56
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