It is currently 24 Jun 2017, 14:26

### 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

# If Fran jumps straight up off the floor and lands on her

Author Message
Manager
Joined: 11 Jan 2007
Posts: 196
Location: Bangkok
If Fran jumps straight up off the floor and lands on her [#permalink]

### Show Tags

04 Feb 2007, 08:17
00:00

Difficulty:

(N/A)

Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 3 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

1.If Fran jumps straight up off the floor and lands on her feet T seconds later, her feet will reach a max-imum height of 1.22T^2 meters above the floor. On one such jump, was Fran off the floor for less than 1 second ?
(1) On her jump Franâ€™s feet reached a maximum height of 1 meter above the floor.
(2) On her jump Fran spent more than 1/4 second ascending.

2.Are all of the numbers in a certain list of 15 numbers equal?
(1) The sum of all of the numbers in the list is 60.
(2) The sum of any 3 numbers in the list is 12.

3.The price of a television set was reduced by 25 percent. What was its original price?
(1) The reduced price was $187.50. (2) The original price exceeded the reduced price by more than$60.00.
_________________

cool

Senior Manager
Joined: 04 Jan 2006
Posts: 279

### Show Tags

04 Feb 2007, 17:56
jet1445 wrote:
1.If Fran jumps straight up off the floor and lands on her feet T seconds later, her feet will reach a max-imum height of 1.22T^2 meters above the floor. On one such jump, was Fran off the floor for less than 1 second ?
(1) On her jump Franâ€™s feet reached a maximum height of 1 meter above the floor.
(2) On her jump Fran spent more than 1/4 second ascending.

Question: Max H = 1.22 * T^2, Is T < 1?

(1) Max H = 1 = 1.22 * T^2

T = 1/sqrt(1.22) = 1/(1...) Thus T <1> 1/4
T < 2/4
T < 1/2 Thus T < 1 (2) SUFF

Senior Manager
Joined: 04 Jan 2006
Posts: 279

### Show Tags

04 Feb 2007, 18:11
jet1445 wrote:
2.Are all of the numbers in a certain list of 15 numbers equal?
(1) The sum of all of the numbers in the list is 60.
(2) The sum of any 3 numbers in the list is 12.

Question: set A = {a1, a2, ..., a15} , is a1 = a2 = ... = a15?

(1) Sum(A) = 60, Thus Ave(A) = 60/15 = 4
This does not mean that all a1 ... a15 is equal INSUFF

(2) The sum of any 3 numbers in the list is 12
or the sum of any 3 number in the list is 3x(4)
To pick any number and still get the same result, the numbers in the set must be the same. a1 = 4 SUFF.

Last edited by devilmirror on 04 Feb 2007, 18:21, edited 1 time in total.
Senior Manager
Joined: 04 Jan 2006
Posts: 279

### Show Tags

04 Feb 2007, 18:14
jet1445 wrote:
3.The price of a television set was reduced by 25 percent. What was its original price?
(1) The reduced price was $187.50. (2) The original price exceeded the reduced price by more than$60.00.

Question: P = orginal price, The reduced price price = 0.75P, Find P

(1) 0.75P = 187.50, P has value SUFF

(2) P - 0.75P > 60

P(1-0.75) > 60

P > 60/0.25 = 60 x 4 = 240 P has more than 1 value INSUFF

Manager
Joined: 11 Jan 2007
Posts: 196
Location: Bangkok

### Show Tags

05 Feb 2007, 09:48
Sorry, I type first quention incorrect , so I post again for your explaination

1.If Fran jumps straight up off the floor and lands on her feet T seconds later, her feet will reach a max-imum height of (1.22T)^2 meters above the floor. On one such jump, was Fran off the floor for less than 1 second ?
(1) On her jump Franâ€™s feet reached a maximum height of 1 meter above the floor.
(2) On her jump Fran spent more than 1/4 second ascending.
_________________

cool

VP
Joined: 09 Jan 2007
Posts: 1045
Location: New York, NY
Schools: Chicago Booth Class of 2010

### Show Tags

05 Feb 2007, 10:22
jet1445 wrote:
Sorry, I type first quention incorrect , so I post again for your explaination

1.If Fran jumps straight up off the floor and lands on her feet T seconds later, her feet will reach a max-imum height of (1.22T)^2 meters above the floor. On one such jump, was Fran off the floor for less than 1 second ?
(1) On her jump Franâ€™s feet reached a maximum height of 1 meter above the floor.
(2) On her jump Fran spent more than 1/4 second ascending.

With or without the correction I would say it is A:

number 1) gives the height, so we can determine the time spent on the whole jump. SUFF

The 2) says that Fran ascended more than 1/4 seconds, it could have been: 3/8 seconds, 1/2 or even 1 second ascending. INSUFF
Re: DS   [#permalink] 05 Feb 2007, 10:22
Display posts from previous: Sort by