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# Over a four-game stretch, Dennis’s bowling score averaged 240. By what

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Manager
Joined: 29 Nov 2018
Posts: 132
Concentration: Marketing, Strategy
Over a four-game stretch, Dennis’s bowling score averaged 240. By what  [#permalink]

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15 Jan 2019, 03:36
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67% (02:09) correct 33% (01:10) wrong based on 3 sessions

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Over a four-game stretch, Dennis’s bowling score averaged 240. By what percent would his score have had to have been higher in order for him to average a perfect game (300)?

A.15
B.20
C.25
D.30
E.50

In this question, calculating either sum is unnecessary, as the percent change
in his average would be the same as the percent change in his total score.
Since the figures are already calculated for you in terms of average, you can
calculate the percent change just given the averages: (300 – 240)/240 = ¼, so
John would have needed to increase his score by 25%.

Simple enough question but a very important concept to remember!
Manager
Joined: 26 Dec 2018
Posts: 142
Location: India
Re: Over a four-game stretch, Dennis’s bowling score averaged 240. By what  [#permalink]

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15 Jan 2019, 03:53
It’s a 4 Game Stretch, so
Original Score = 4 x 240
Expected Score = 4 x 300

By what PERECNT would his score have had to have been HIGHER in order for him to average a perfect game (300)?

We need to calculate Expected Percentage Increase
Percentage Increase =((Change In Score) / Original Score) x 100 %

Change in Score = 4 x (300-240) = 4 x 60

Percentage Increase = ((4 x 60 ) / (4 x 240)) x 100%
= 25%
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GOOD LUCK!

Manager
Joined: 13 Feb 2018
Posts: 159
GMAT 1: 640 Q48 V28
Over a four-game stretch, Dennis’s bowling score averaged 240. By what  [#permalink]

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15 Jan 2019, 03:56
Sorry but I think its poorly worded

"By what percent would his score" you mean last 4th score? all the four score or you mean the fifth score?
"By what percent would his score have had to have been higher" than what? his average score or something else?

P.S. make some changes and it's a good question

Cheers
L
Math Expert
Joined: 02 Sep 2009
Posts: 53716
Re: Over a four-game stretch, Dennis’s bowling score averaged 240. By what  [#permalink]

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15 Jan 2019, 04:09
cfc198 wrote:
Over a four-game stretch, Dennis’s bowling score averaged 240. By what percent would his score have had to have been higher in order for him to average a perfect game (300)?

A.15
B.20
C.25
D.30
E.50

In this question, calculating either sum is unnecessary, as the percent change
in his average would be the same as the percent change in his total score.
Since the figures are already calculated for you in terms of average, you can
calculate the percent change just given the averages: (300 – 240)/240 = ¼, so
John would have needed to increase his score by 25%.

Simple enough question but a very important concept to remember!

Discussed here: https://gmatclub.com/forum/over-a-four- ... 76701.html

TOPIC IS LOCKED AND ARCHIVED.
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Re: Over a four-game stretch, Dennis’s bowling score averaged 240. By what   [#permalink] 15 Jan 2019, 04:09
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