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Question From Manhattan Prep Book 9

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Question From Manhattan Prep Book 9 [#permalink]

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New post 16 Feb 2017, 05:29
Hello, I am using the 6th edition of the Manhattan Prep books and i came across a sample problem that I am not understanding where they got the the numbers from. The problem is on page 135-136 of Book 9 (Integrated Reasoning and essay). I don't understand how they got to 1,680 total years based off of the diagram and was wondering what I may be doing wrong. Any help would be greatly appreciated.

Ashley

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Re: Question From Manhattan Prep Book 9 [#permalink]

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New post 16 Feb 2017, 06:18
It would be better if you can type the question here

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Re: Question From Manhattan Prep Book 9 [#permalink]

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New post 16 Feb 2017, 20:40
Its not a question per se more like a diagram. i have attached a copy of it here as a pdf. I don't understand how they got the 1680 as the total amount of years. The way i was setting up the problem was as follows:

0 years-10 students-
1 year -30 students=total 30 years between them
2 years-100 years=total 200 years between them
etc.
If I am doing that correctly I don't understand where they get the full 1680 from or if it was some ambiguous number they came up with. any guidance would be greatly appreciated.
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Re: Question From Manhattan Prep Book 9 [#permalink]

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New post 16 Feb 2017, 20:53
That's just an example and the chart is not full.
Anyways u can calculate total number of years by multiplying number of students with years.

Like
(10*0)+(30*1)+(100*2)+(80*3)+(60*4)+.... As you can see the data is provided only for 280 students out of 500.
You can not get the total number of years.
The number used here is just for an example.

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Re: Question From Manhattan Prep Book 9 [#permalink]

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New post 16 Feb 2017, 21:07
Awesome! thank you so much! Math is not my forte and I thought I was missing something and wanted to make sure I was missing an important step.

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Re: Question From Manhattan Prep Book 9 [#permalink]

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New post 17 Feb 2017, 03:46
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It is stated as an example.
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Kindly press "+1 Kudos" if the post helped :)

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Re: Question From Manhattan Prep Book 9 [#permalink]

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New post 17 Feb 2017, 04:00
Spartan85 wrote:
It is stated as an example.
yes it was stated as an example but it was one of the first that didn't contain all of the info. Wanted to make sure I was in the right track. It has been awhile since I've done this type of math. Thanks again and have a great morning!

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Re: Question From Manhattan Prep Book 9   [#permalink] 17 Feb 2017, 04:00
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