If Esperanza will be 35 years old in 6 years

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BTGmoderatorDC: Moderator; Posts: 7187; Joined: Thu Sep 07, 2017 4:43 pmFollowed by: 23 members

by BTGmoderatorDC » Sun Jan 14, 2018 4:01 pm

If Esperanza will be 35 years old in 6 years, how old was she x years ago?

(A) 41 - x
(B) x - 41
(C) 35 - x
(D) x - 29
(E) 29 - x

I'm confused how to set up the formulas here. Can any experts help?

OA E

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Source: Beat The GMAT — Problem Solving | Sun Jan 14, 2018 4:01 pm

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Jay@ManhattanReview: GMAT Instructor; Posts: 3008; Joined: Mon Aug 22, 2016 6:19 amFollowed by: 34 members; Location: Grand Central / New York; Thanked: 470 times

by Jay@ManhattanReview » Sun Jan 14, 2018 10:11 pm

lheiannie07 wrote:If Esperanza will be 35 years old in 6 years, how old was she x years ago?

(A) 41 - x
(B) x - 41
(C) 35 - x
(D) x - 29
(E) 29 - x

I'm confused how to set up the formulas here. Can any experts help?

OA E

Given that Esperanza will be 35 years old in 6 years, she is 35 - 6 = 29 years now. Thus, she was 29 - x years old x years ago.

The correct answer: E

Hope this helps!

-Jay
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DrMaths: Senior | Next Rank: 100 Posts; Posts: 82; Joined: Mon Jan 15, 2018 2:01 am

by DrMaths » Mon Jan 15, 2018 3:24 am

If Esperanza will be 35 years old in 6 years from now, then Esperanza must be 29 currently (because 29 + 6 = 35).
x years ago, she was x years YOUNGER, so we SUBTRACT x.
Answer = 29 - x

In other words, when structuring the algebra, use + and - respectively with older and younger, hotter and colder, bigger and smaller, or whatever increase and decrease context is in the question.

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Scott@TargetTestPrep: GMAT Instructor; Posts: 8177; Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members; Location: Los Angeles, CA; Thanked: 43 times

by Scott@TargetTestPrep » Mon Aug 05, 2019 6:17 pm

BTGmoderatorDC wrote:If Esperanza will be 35 years old in 6 years, how old was she x years ago?

(A) 41 - x
(B) x - 41
(C) 35 - x
(D) x - 29
(E) 29 - x

I'm confused how to set up the formulas here. Can any experts help?

OA E

We can let E = Esperanza's age today, and create the equation:

E + 6 = 35

E = 29

Thus, she was 29 - x years old x years ago.

Answer: E

Scott Woodbury-Stewart
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