GMAC paper based test

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oliviajoules: Newbie | Next Rank: 10 Posts; Posts: 5; Joined: Tue Oct 21, 2008 6:35 am; Location: Singapore; GMAT Score:640

GMAC paper based test

by oliviajoules » Tue Nov 25, 2008 2:46 am

Hi guys,

I have attached 4 problems that I got wrong when I did the paper based test, I have the answers but no explanations.

Would some of the math pros please explain these?

OA will follow Soon.

Many thanks!!

Attachments

PS.doc: (80 KiB) Downloaded 151 times

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Source: Beat The GMAT — Problem Solving | Tue Nov 25, 2008 2:46 am

4meonly: Legendary Member; Posts: 891; Joined: Sat Aug 16, 2008 4:21 am; Thanked: 27 times; Followed by:1 members; GMAT Score:660(

by 4meonly » Tue Nov 25, 2008 4:48 am

I will answer 13th question - it was interesting to me.

line between points
(0;30) and (50;0)
how many interegs?

to test each point looks crazy

foemula for the line between points (0;30) and (50;0) is
y= -3/5*x + 30

How many integers for x and y?
y(should be integer)= -3/5*x (should be integer) + 30 (integer)
so we should test
y= -3/5*x
if 3/5*x should be an integer, than x should be any multiply of 5
and since we know that 0<x<50
we are letf only with 0, 5, 10, .... 50 - total 11 integers.

So, I think the answer is 11

D

OA?

14.
C
10^100 has 101 digits

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jnellaz: Master | Next Rank: 500 Posts; Posts: 114; Joined: Mon Oct 20, 2008 7:03 pm; Thanked: 4 times; Followed by:5 members

by jnellaz » Tue Nov 25, 2008 6:31 am

I will give the first question a whirl:

148 documents with an average of 10 pages per document = 1480 pages

15 seconds a page = 22, 200 seconds

There are 3600 seconds in an hours, Thus:

22200/3600 = 222 / 36 (I reduced both numbers and elimnated the zeros)

222/36 = Approximately 6 Answer D.

Last edited by jnellaz on Tue Nov 25, 2008 6:40 am, edited 1 time in total.

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jnellaz: Master | Next Rank: 500 Posts; Posts: 114; Joined: Mon Oct 20, 2008 7:03 pm; Thanked: 4 times; Followed by:5 members

by jnellaz » Tue Nov 25, 2008 6:39 am

The second question is interesting. I think it it trying to sound a little more complicated than it is. This is how I went about it. Ultimately, you are trying to get:

3 + 4/sqrt (5-x) to equal to 6 OR basically

4/sqrt(5-x) to equal to 3.

So the question is - what goes into 4 and equals 3? Approximately 1.3. So we are trying to get the denominator sqrt(5-x) to equal to about 1.3.
We know from our practice that sqrt(2) is approximately 1.4, so we need (5-x) to equal a little less than 2.

After looking at the answer choices - IMO 3.2 was the closest. Choice E.

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niraj_a: Legendary Member; Posts: 708; Joined: Sun Jun 01, 2008 4:59 am; Location: USA; Thanked: 13 times; Followed by:1 members