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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: 56244
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:

15% (low)

Question Stats:

81% (01:15) correct 19% (01:29) wrong based on 38 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: 187
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: 16
Location: India
Concentration: General Management, Finance
Schools: WHU MBA"20 (WL)
GMAT 1: 740 Q49 V41
GPA: 3.49
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: 218
Location: United States
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   [#permalink] 23 Dec 2017, 08:51
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