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

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Math Expert
Joined: 02 Sep 2009
Posts: 43335

Kudos [?]: 139576 [0], given: 12794

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

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21 Dec 2017, 20:21
00:00

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(N/A)

Question Stats:

87% (01:09) correct 13% (00:52) wrong based on 15 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
[Reveal] Spoiler: OA

_________________

Kudos [?]: 139576 [0], given: 12794

Manager
Joined: 11 Feb 2017
Posts: 184

Kudos [?]: 10 [0], given: 199

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

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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

Kudos [?]: 10 [0], given: 199

Intern
Joined: 15 Feb 2017
Posts: 11

Kudos [?]: 5 [0], given: 2

Location: India
Concentration: International Business, General Management
WE: Engineering (Other)
Re: On Tuesday, three boys collected an average (arithmetic mean) of 20 bo [#permalink]

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22 Dec 2017, 00:09
20+40+80+120=300, 300x3=900
(E)

Kudos [?]: 5 [0], given: 2

Manager
Joined: 24 Nov 2016
Posts: 151

Kudos [?]: 31 [0], given: 40

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

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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.

Kudos [?]: 31 [0], given: 40

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