Investment, XY plane

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qduong: Junior | Next Rank: 30 Posts; Posts: 18; Joined: Wed Jun 01, 2011 11:02 pmFollowed by: 1 member

by qduong » Thu Jun 16, 2011 8:18 pm

Please help explain. Thank you.

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Source: Beat The GMAT — Data Sufficiency | Thu Jun 16, 2011 8:18 pm

amit2k9: Master | Next Rank: 500 Posts; Posts: 461; Joined: Tue May 10, 2011 9:09 amFollowed by: 3 members; Location: pune; Thanked: 36 times

by amit2k9 » Thu Jun 16, 2011 8:59 pm

DS 3

a xr/100 = (24000-x)*7/100 two variables x and r. not sufficient.

b x*5/100 = (24000-x)*7/100 only one variable x. sufficient.

B it is.

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amit2k9: Master | Next Rank: 500 Posts; Posts: 461; Joined: Tue May 10, 2011 9:09 amFollowed by: 3 members; Location: pune; Thanked: 36 times

by amit2k9 » Thu Jun 16, 2011 9:05 pm

DS2

a z can be 1 or 5 for t = -3 or -3/5. not sufficient.

b t= -5,-6 or so z = 3/5 or 1/2 thus always a ratio.

Hence B.

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amit2k9: Master | Next Rank: 500 Posts; Posts: 461; Joined: Tue May 10, 2011 9:09 amFollowed by: 3 members; Location: pune; Thanked: 36 times

by amit2k9 » Thu Jun 16, 2011 9:08 pm

can been discussed a lot.

here it is - https://gmatclub.com/forum/gmat-prep-xy- ... 60260.html

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abidshariff: Senior | Next Rank: 100 Posts; Posts: 37; Joined: Tue Jan 18, 2011 2:50 am; Thanked: 2 times

by abidshariff » Mon Jun 20, 2011 10:01 am

For DS2...its E...

zt <-3, is z<4?

by using a i.e z<9, we don't know anything about t..so z can be < or > 4.
now take b. say t=-5(t<-4), and z=3, so zt=-15<-3, take z=5 zt=-25<-3. So z can be < or >4

So C is clearly not the ans as z=3,5<9.

So E

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treker: Senior | Next Rank: 100 Posts; Posts: 33; Joined: Fri Aug 22, 2008 9:32 pm; Thanked: 1 times

by treker » Tue Jun 21, 2011 5:38 am

amit2k9 wrote:DS 3

a xr/100 = (24000-x)*7/100 two variables x and r. not sufficient.

b x*5/100 = (24000-x)*7/100 only one variable x. sufficient.

B it is.

For DS 3, Ans is C and not B. Without stmt 1, how can you assume that the interest on both amounts are equal?

Thanks!
- Treker

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