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# The graph above shows how long departures from a certain airport were

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Math Expert
Joined: 02 Sep 2009
Posts: 60515
The graph above shows how long departures from a certain airport were  [#permalink]

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18 Nov 2015, 23:33
00:00

Difficulty:

45% (medium)

Question Stats:

69% (01:36) correct 31% (01:37) wrong based on 114 sessions

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The graph above shows how long departures from a certain airport were delayed on a certain day. If 1,200 flights were delayed, how many flights departed on time?

A. 250
B. 300
C. 350
D. 400
E. 900

Attachment:

2015-11-19_1032.png [ 4.32 KiB | Viewed 2059 times ]

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Math Expert
Joined: 02 Aug 2009
Posts: 8344
Re: The graph above shows how long departures from a certain airport were  [#permalink]

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19 Nov 2015, 03:46
Bunuel wrote:

The graph above shows how long departures from a certain airport were delayed on a certain day. If 1,200 flights were delayed, how many flights departed on time?

A. 250
B. 300
C. 350
D. 400
E. 900

Attachment:
2015-11-19_1032.png

Hi,
as per graph 75% delayed so 25 % were on time..
given that 75%=1200 ..
so 25% =400..
ans D
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Re: The graph above shows how long departures from a certain airport were  [#permalink]

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19 Nov 2015, 19:01
Flights delayed = 75%
Flights on Time = 25%

Total Number f flights = 75% of Total = 1200 => 1600
Flights on time = 25% of 1600 => 400

Ans: D
Director
Joined: 12 Nov 2016
Posts: 692
Location: United States
Schools: Yale '18
GMAT 1: 650 Q43 V37
GRE 1: Q157 V158
GPA: 2.66
Re: The graph above shows how long departures from a certain airport were  [#permalink]

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21 Jun 2017, 05:52
Bunuel wrote:

The graph above shows how long departures from a certain airport were delayed on a certain day. If 1,200 flights were delayed, how many flights departed on time?

A. 250
B. 300
C. 350
D. 400
E. 900

Attachment:
2015-11-19_1032.png

To solve this question just read the graph carefully- the sum of the following values, 75 percent, is represented by 1200 flights so

x(3/4) =12000
3x= 48000
x= 16000

16000-12000= 400

Thus
"D"
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Affiliations: Target Test Prep
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Posts: 2806
Re: The graph above shows how long departures from a certain airport were  [#permalink]

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24 Jun 2017, 08:19
Bunuel wrote:

The graph above shows how long departures from a certain airport were delayed on a certain day. If 1,200 flights were delayed, how many flights departed on time?

A. 250
B. 300
C. 350
D. 400
E. 900

According to the chart, we see that 43 + 17 + 12 + 3 = 75%, or ¾, of the total flights were delayed. If we let T = the total number of flights, we have:

(3/4)(T) = 1200

3T = 1200 x 4

T = 400 x 4 = 1600.

Since 100 - 75 = 25%, or ¼, of the flights were on time, 1/4 x 1600 = 400 flights were on time.

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Re: The graph above shows how long departures from a certain airport were   [#permalink] 24 Jun 2017, 08:19
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