Was the decrease less than 10 percent?

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mehravikas: Legendary Member; Posts: 1161; Joined: Mon May 12, 2008 2:52 amFollowed by: 1 member; Location: Sydney; Thanked: 23 times

by mehravikas » Sat Jun 07, 2008 5:59 pm

S7-25 A total of 774 doctorates in mathematics were granted to United States citizens by American universities in the 1972-1973 school year, and W of these doctorates were granted to women. The total of such doctorates in the 1986-1987 school year was 362, and w of these were granted to women. If the number of doctorates in mathematics granted to female citizens of the United States by American universities decreased from the 1972-1973 school year to the 1986-1987 school year, was the decrease less than 10 percent?

1. 1/10 < W/774 < 1/9
2. W = w + 5

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Source: Beat The GMAT — Data Sufficiency | Sat Jun 07, 2008 5:59 pm

netigen: Legendary Member; Posts: 631; Joined: Mon Feb 18, 2008 11:57 pmFollowed by: 3 members; Thanked: 29 times

by netigen » Sat Jun 07, 2008 8:20 pm

Answer is C

from A you get the range of W

77.4 < W < 86

from B we get the delta i.e W-w = 5

so the % change will be 5 x 100 /W

since, we know that W > 50 so the % decrease will be less than 10% for the given range of W (from A)

Last edited by netigen on Sat Jun 07, 2008 9:27 pm, edited 1 time in total.

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mehravikas: Legendary Member; Posts: 1161; Joined: Mon May 12, 2008 2:52 amFollowed by: 1 member; Location: Sydney; Thanked: 23 times

by mehravikas » Sat Jun 07, 2008 9:25 pm

Didnt get it, can you elaborate, please?

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sanjaylakhani: Senior | Next Rank: 100 Posts; Posts: 47; Joined: Wed Apr 30, 2008 8:13 pm

by sanjaylakhani » Sun Jun 08, 2008 9:12 am

Hi

The answer can be B- as B itself provides the answer as to whether the reduction is less then 10%.

If W-w=5 ,so the % reduction is 5/774*100 , which is less then 10%, so B itself is sufficient.

In such cases if we use B also and use A along with it, considering the fact that B alone can solve this, would answer still be C.

Pls Clarify

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netigen: Legendary Member; Posts: 631; Joined: Mon Feb 18, 2008 11:57 pmFollowed by: 3 members; Thanked: 29 times

by netigen » Sun Jun 08, 2008 9:28 am

Your assumption is not correct.

774 = M + W

where M = PHD assigned to men and W = phd assigned to women

in case, W = 10

then the % change will be (5/10) x 100 = 50%

so A is required to know the range of W

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sanjaylakhani: Senior | Next Rank: 100 Posts; Posts: 47; Joined: Wed Apr 30, 2008 8:13 pm

by sanjaylakhani » Sun Jun 08, 2008 9:32 am

thanks netigen, i overlooked a very basic requirement

thanks for correcting

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