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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: 48117
On Tuesday, three boys collected an average (arithmetic mean) of 20 bo  [#permalink]

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21 Dec 2017, 21:21
00:00

Difficulty:

25% (medium)

Question Stats:

84% (01:06) correct 16% (01:14) wrong based on 19 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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Manager
Joined: 11 Feb 2017
Posts: 198
Re: On Tuesday, three boys collected an average (arithmetic mean) of 20 bo  [#permalink]

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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
Intern
Joined: 15 Feb 2017
Posts: 15
Location: India
GMAT 1: 740 Q49 V41
WE: Engineering (Other)
Re: On Tuesday, three boys collected an average (arithmetic mean) of 20 bo  [#permalink]

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22 Dec 2017, 01:09
20+40+80+120=300, 300x3=900
(E)
Manager
Joined: 24 Nov 2016
Posts: 152
Re: On Tuesday, three boys collected an average (arithmetic mean) of 20 bo  [#permalink]

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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: $$3*(160)=480$$

$$Total=60+120+240+480=900$$

Re: On Tuesday, three boys collected an average (arithmetic mean) of 20 bo &nbs [#permalink] 23 Dec 2017, 08:51
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