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On Tuesday, three boys collected an average (arithmetic mean) of 20 bo

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On Tuesday, three boys collected an average (arithmetic mean) of 20 bo  [#permalink]

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New post 21 Dec 2017, 20:21
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E

Difficulty:

  25% (medium)

Question Stats:

81% (01:12) correct 19% (01:29) wrong based on 22 sessions

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On Tuesday, three boys collected an average (arithmetic mean) of 20 bottles each . On each of the 3 following days the group collected twice as many bottles as they had on the previous day. How many bottles did the boys collect during the four days?

A. 120
B. 240
C. 300
D. 600
E. 900

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Joined: 11 Feb 2017
Posts: 189
Re: On Tuesday, three boys collected an average (arithmetic mean) of 20 bo  [#permalink]

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New post 22 Dec 2017, 00:00
Bunuel wrote:
On Tuesday, three boys collected an average (arithmetic mean) of 20 bottles each . On each of the 3 following days the group collected twice as many bottles as they had on the previous day. How many bottles did the boys collect during the four days?

A. 120
B. 240
C. 300
D. 600
E. 900



60+120+240+480 = 900
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Concentration: General Management, Finance
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GPA: 3.49
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Re: On Tuesday, three boys collected an average (arithmetic mean) of 20 bo  [#permalink]

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New post 22 Dec 2017, 00:09
20+40+80+120=300, 300x3=900
(E)
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Re: On Tuesday, three boys collected an average (arithmetic mean) of 20 bo  [#permalink]

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New post 23 Dec 2017, 07:51
Bunuel wrote:
On Tuesday, three boys collected an average (arithmetic mean) of 20 bottles each . On each of the 3 following days the group collected twice as many bottles as they had on the previous day. How many bottles did the boys collect during the four days?

A. 120
B. 240
C. 300
D. 600
E. 900


\(Sum=Boys*Average\)

Tue: \(3*(20)=60\)
Wed: \(3*(40)=120\)
Thu: \(3*(80)=240\)
Fri: \(3*(160)=480\)

\(Total=60+120+240+480=900\)

(E) is the answer.
GMAT Club Bot
Re: On Tuesday, three boys collected an average (arithmetic mean) of 20 bo &nbs [#permalink] 23 Dec 2017, 07:51
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On Tuesday, three boys collected an average (arithmetic mean) of 20 bo

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