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# The sum of Abbie's age and Iris's age is 42 years. 11 years

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Intern
Joined: 27 Nov 2008
Posts: 3
The sum of Abbie's age and Iris's age is 42 years. 11 years  [#permalink]

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Updated on: 02 Jan 2014, 04:43
2
3
00:00

Difficulty:

(N/A)

Question Stats:

85% (00:41) correct 15% (02:57) wrong based on 22 sessions

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The sum of Abbie's age and Iris's age is 42 years. 11 years ago, Abbie was three times as old as Iris. How old will Abbie be in 2 years?

28

Originally posted by scraby07 on 01 Jan 2014, 07:42.
Last edited by Bunuel on 02 Jan 2014, 04:43, edited 1 time in total.
Edited the question.
Intern
Joined: 06 Jul 2014
Posts: 5
Location: India
GPA: 3.5
Re: The sum of Abbie's age and Iris's age is 42 years. 11 years  [#permalink]

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25 Mar 2017, 03:44
5
Let Ages be A and I

A + I= 42

A-11= 3I-33

by solving simultaneously we get A=26 and add 2 years to it answer is 28.
##### General Discussion
Intern
Joined: 10 Oct 2012
Posts: 7
GPA: 3.87
Re: The sum of Abbie's age  [#permalink]

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01 Jan 2014, 11:13
1
The easiest and fastest strategy on "Age" questions like this is "Working Backwards." Some instructors call it back-solving. In other words, it's best to start with the answer choices and see which one works. Do you have answer choices for this question? If so, I'll illustrate how to use the strategy. I think you'll find it's much more efficient than trying to set up an algebraic solution!
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Joined: 02 Sep 2009
Posts: 51067
Re: The sum of Abbie's age and Iris's age is 42 years. 11 years  [#permalink]

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02 Jan 2014, 04:44
Intern
Joined: 16 Jan 2017
Posts: 1
The sum of Abbie's age and Iris's age is 42 years. 11 years  [#permalink]

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24 Mar 2017, 10:00
1
A+I = 42
A-11 = 3(I-11)

We need to find, A+2

I=42-A from the first eqn.

A-11 = 3(31-A), via substitution

A=26

A+2 = 28

28 is the desired result.

Whoops, I apologize for necro-posting.
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Posts: 9088
Re: The sum of Abbie's age and Iris's age is 42 years. 11 years  [#permalink]

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24 Jul 2018, 19:47
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: The sum of Abbie's age and Iris's age is 42 years. 11 years &nbs [#permalink] 24 Jul 2018, 19:47
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# The sum of Abbie's age and Iris's age is 42 years. 11 years

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