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Re: in june 1990 a small academic press published an initial run [#permalink]

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02 Feb 2014, 11:41

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Hi, This is how I arrived at the answers:- Let the sales for the period 1990-95 be 'x' Therefore, the sales for the period 1995-2000 is '1.52x' Now, total sales for the period is 'x+1.52x=2.52x=3843' Solving we get x=1525. Since the question asks for the closest approximation we can approximate the value of x to 1530. Therefore, sales for the period 1990-95 is 1530 (after closest approximation) and, sales for the period 1995-2000 is 2318. Hence, the sales for the period 2000-05 is 2x2318=4636 which after approximation would be 4640. hope it helps. _________________

If you shut your door to all errors, truth will be shut out.

Re: in june 1990 a small academic press published an initial run [#permalink]

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01 Apr 2015, 00:01

No worries guys, you'll have access to the on-screen calculator for the Integrated Reasoning section of the exam. At times, you may want to use the calculator to do some real-world calculations quickly. Weird decimals or percentages are fair game on the IR section.

Re: in june 1990 a small academic press published an initial run [#permalink]

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01 Apr 2015, 21:19

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Expert's post

Hi All,

This prompt is more about organization and basic arithmetic than anything else. You do NOT need the calculator as long as you take good notes, make some reasonable estimates and do some multiplication.

From the information in the prompt, we can make a little table of data (based around three 5-year 'blocks' of time):

'90-'95: 2500 books published; X books sold '95-'00: >2500 published; 1.52X books sold

Total books sold '90-'00 = 3843 = 2.52X

From here, you should quickly note that X MUST be > 1,000. A reasonable estimate would be X = 1500 (try multiplying 2.5 by 1500 and you'll see).

'00-'05: 2(1.52X) books sold = 3.04X books sold

The question asks for TOTAL BOOKS SOLD from '90 - '95 and from '00-'05

Using X = 1500 as an estimate.... '90-'95 = X = 1500 books sold

'00-'05 = 3.04X = about 4500 books sold

From the given values in the table, the only answers that are close are:

Re: in june 1990 a small academic press published an initial run [#permalink]

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12 Jul 2015, 07:18

Dear, Thanks for the explanation. I was just lost before I read this post. But the information "that 2500 copies were published in 1990" is useless for this problem?

in june 1990 a small academic press published an initial run [#permalink]

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12 Jul 2015, 08:07

Expert's post

andy2whang wrote:

Dear, Thanks for the explanation. I was just lost before I read this post. But the information "that 2500 copies were published in 1990" is useless for this problem?

Thanks! Regards Andy

Yes, you have not been given any information from this statement how many of those 2500 books were actually sold. But in the next line it is mentioned that 50% more books were sold from 95-2000 and that the total till 2000 was 3843 books.

So, you can setup the equations like this:

Let books sold in 90-95 = x ---> books sold from 95-2000 = 1.52x (as it is 52% more)

Thus x+1.52x = 3843 ----> x=1525 books.

Also given is that during the period 2000-2005, twice the number of books sold in the period 95-2000 were sold. Thus books sold in 2000-05 period = 2*1.52x = 3x = 4636 books.

Re: in june 1990 a small academic press published an initial run [#permalink]

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23 Feb 2016, 15:36

I found it easier to back-solve from the answer choices. Once you figure out that 00-05 is 2(1.5)x I just looked at the small numbers and found one that tripled into one of the big numbers. Easy math

gmatclubot

Re: in june 1990 a small academic press published an initial run
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23 Feb 2016, 15:36