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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, 21:21
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Question Stats:

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

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New post 22 Dec 2017, 01:00
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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Re: On Tuesday, three boys collected an average (arithmetic mean) of 20 bo  [#permalink]

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New post 22 Dec 2017, 01:09
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, 08:51
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.
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Re: On Tuesday, three boys collected an average (arithmetic mean) of 20 bo   [#permalink] 23 Dec 2017, 08:51
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On Tuesday, three boys collected an average (arithmetic mean) of 20 bo

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