GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

 It is currently 18 Jan 2020, 08:34

### 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

# Fifty percent of all the students attending a school on a certain day

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 60467
Fifty percent of all the students attending a school on a certain day  [#permalink]

### Show Tags

11 Nov 2019, 04:23
00:00

Difficulty:

55% (hard)

Question Stats:

48% (01:14) correct 52% (01:53) wrong based on 30 sessions

### HideShow timer Statistics

Fifty percent of all the students attending a school on a certain day arrived by 7:00 AM. How many students arrived by 7:00 AM on that day?

(1) Fifteen students arrived between 7:00 AM and 8:00 AM, and 4/5 of that day’s total attending students arrived by 8:00 AM.

(2) Ten students arrived after 8:00 AM that day.

Are You Up For the Challenge: 700 Level Questions

_________________
Math Expert
Joined: 02 Aug 2009
Posts: 8342
Re: Fifty percent of all the students attending a school on a certain day  [#permalink]

### Show Tags

11 Nov 2019, 09:07
Fifty percent of all the students attending a school on a certain day arrived by 7:00 AM. How many students arrived by 7:00 AM on that day?

(1) Fifteen students arrived between 7:00 AM and 8:00 AM, and 4/5 of that day’s total attending students arrived by 8:00 AM.
$$\frac{4}{5}$$ means $$\frac{4}{5}*100=80%$$ arrive by 8:00 AM. but fifteen students arrived between 7:00 AM and 8:00 AM.
Also, fifty percent of all the students attending a school on a certain day arrived by 7:00 AM, so 80%-50%=30%=15....100%=$$\frac{15}{30}*100=50$$.
thus 50% or 25 students attending a school on a certain day arrived by 7:00 AM.

(2) Ten students arrived after 8:00 AM that day.
insuff

A
_________________
Manager
Status: Student
Joined: 14 Jul 2019
Posts: 149
Location: United States
Concentration: Accounting, Finance
GPA: 3.9
WE: Education (Accounting)
Re: Fifty percent of all the students attending a school on a certain day  [#permalink]

### Show Tags

12 Nov 2019, 22:06
Fifty percent of all the students attending a school on a certain day arrived by 7:00 AM. How many students arrived by 7:00 AM on that day?

(1) Fifteen students arrived between 7:00 AM and 8:00 AM, and 4/5 of that day’s total attending students arrived by 8:00 AM.

(2) Ten students arrived after 8:00 AM that day

From question stem, 50% students arrive by 7:00 AM. We have to find out the number of students who arrive by 7:00 AM.

(1) (4/5 - 1/2) = 3/10 of total students come between 7:00 AM and 8:00 AM. From this we can find out total number of students and students who arrive by 7:00 AM.SUFFICIENT.

(2) We don't know what percentage of total students these 10 students is, so NOT SUFFICIENT.

Re: Fifty percent of all the students attending a school on a certain day   [#permalink] 12 Nov 2019, 22:06
Display posts from previous: Sort by