It is currently 27 Jun 2017, 20:58

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Long time since we had one of these discussions. Here's the

Author Message
CEO
Joined: 15 Aug 2003
Posts: 3454
Long time since we had one of these discussions. Here's the [#permalink]

### Show Tags

20 Aug 2004, 14:06
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Long time since we had one of these discussions. Here's the link to the problem. I think the answers will show on monday at the MGMAT website

http://manhattangmat.com/index.cfm?cid=11&sethome=1
Director
Joined: 20 Jul 2004
Posts: 592

### Show Tags

20 Aug 2004, 22:28
Quote:
If d represents the hundredths digit and e represents the thousandths digit in the decimal .4de, what is the value of this decimal rounded to the nearest tenth?

(1) d â€“ e is equal to a positive perfect square.
(2) sqrt(d) > e^2

C?

Number = 0.4 if d<=5
Number = 0.5 if d>5
Our aim is to see if d is lesser than or equal to 5.

(1) d â€“ e is equal to a positive perfect square.
combination for positive perfect square for < 10 pairs are:
9 = 9-0
4 = 9-5, 8-4, 7-3, 6-2, 5-1, 4-0
1 = 9-8, 8-7, ...., 2-1
We cannot decide. d may be 2 or 9

(2) sqrt(d) > e^2
d > e^4
e has to be 1, since e=2 will make d>16 not possible.
if e=1, e^4 = 1 and d can be 2 or 9
Insufficient

Together,
e=1 from (2)
d should be 5 or 2 from (1)
In both cases, d<=5 and hence the value of the given decimal is 0.4
Senior Manager
Joined: 05 Feb 2004
Posts: 290
Location: USA

### Show Tags

21 Aug 2004, 08:32
Hey hardworker_indian, if d =5 then deimal is 0.451 and if d = 2 decimal is 0.421................Isn't 0.451 rounded to nearest tenth 0.5?? In that case answer should be E......correct me if I am wrong!!
cbrf3
Manager
Joined: 11 Jul 2004
Posts: 119

### Show Tags

21 Aug 2004, 10:20
e none

a states d-e = +ve perfect sq so d-e could be 9-0 = 9 (sq of 3)
or d-e = 4 (sq of 2)

if d-e = 9 (9,0) then ans .5 if d-e (4,0 or 9-5) = 4 then ans .4 or .5 so not suff

b is in suff becuase sqrt (d) > e * e

if d is 2 sqrt (2) =1 .414

1.4 > e*e then e must be 1

if d is 9 then sqrt (9) = 1.732 > e*e when e = 0 or 1 e cant be 5

combine together still not suff
Director
Joined: 20 Jul 2004
Posts: 592

### Show Tags

21 Aug 2004, 19:20
cbrf3 wrote:
Hey hardworker_indian, if d =5 then deimal is 0.451 and if d = 2 decimal is 0.421................Isn't 0.451 rounded to nearest tenth 0.5?? In that case answer should be E......correct me if I am wrong!!
cbrf3

Yes, you are right. Corrected answer:

E.

Number = 0.4 if d<5
Number = 0.5 if d>=5
Our aim is to see if d is lesser than 5.

(1) d â€“ e is equal to a positive perfect square.
combination for positive perfect square for < 10 pairs are:
9 = 9-0
4 = 9-5, 8-4, 7-3, 6-2, 5-1, 4-0
1 = 9-8, 8-7, ...., 2-1
We cannot decide. d may be 2 or 9

(2) sqrt(d) > e^2
d > e^4
e has to be 1, since e=2 will make d>16 not possible.
if e=1, e^4 = 1 and d can be 2 or 9
Insufficient

Together,
e=1 from (2)
d should be 5 or 2 from (1)
In the first case, value = 0.451 ~ 0.5 and
in the second case, value = 0.421 ~ 04
Insufficient.
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4288

### Show Tags

21 Aug 2004, 19:34
Yes, I also got E on this one.
_________________

Best Regards,

Paul

Intern
Joined: 21 Aug 2004
Posts: 3

### Show Tags

21 Aug 2004, 22:59
Yea got E...
I think its a challenging question not because its not solvable, but how you solve this under time constraints...
Director
Joined: 05 May 2004
Posts: 574
Location: San Jose, CA

### Show Tags

22 Aug 2004, 00:37
I got E
d-e can be 1,4,9 however there can be lots of d,e combos with d> or <5 hece 1 is not suffucuent
root(d)>e-square or d>e^4
it is not sufficient for same reason as 1
using 1 and 2 there can the following combos
for e=0 d=1/4/9
for e=1 d=2/5
hence the decimal can be rounded off to either 0.5(e0d9) or 0.4(for other combos
22 Aug 2004, 00:37
Display posts from previous: Sort by