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Last year, an appliance store sold an average (arithmetic mean) of 42

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Last year, an appliance store sold an average (arithmetic mean) of 42 [#permalink] New post   23 Feb 2017, 06:17
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Last year, an appliance store sold an average (arithmetic mean) of 42 microwave ovens per month. In the first 10 months of this year, the store has sold an average (arithmetic mean) of only 20 microwaves per month. What was the average number of microwaves sold per month during the entire 22- month period?

(A) 21
(B) 30
(C) 31
(D) 32
(E) 44
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D
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Re: Last year, an appliance store sold an average (arithmetic mean) of 42 [#permalink] New post   23 Feb 2017, 09:04
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SajjadAhmad wrote:
Last year, an appliance store sold an average (arithmetic mean) of 42 microwave ovens per month. In the first 10 months of this year, the store has sold an average (arithmetic mean) of only 20 microwaves per month. What was the average number of microwaves sold per month during the entire 22- month period?

(A) 21
(B) 30
(C) 31
(D) 32
(E) 44


Total number of microwaves ovens sold in last 12 months = 42*12 = 504
Total number of microwaves ovens sold in last 10 months = 20*10 = 200

Total number of microwaves ovens sold in last 22 months = 504 + 200 => 704

Thus, average number of microwaves ovens sold in last 22 months = 704/22 => 32

Thus, correct answer must be (D) 32...
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Re: Last year, an appliance store sold an average (arithmetic mean) of 42 [#permalink] New post   27 Feb 2017, 11:49
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SajjadAhmad wrote:
Last year, an appliance store sold an average (arithmetic mean) of 42 microwave ovens per month. In the first 10 months of this year, the store has sold an average (arithmetic mean) of only 20 microwaves per month. What was the average number of microwaves sold per month during the entire 22- month period?

(A) 21
(B) 30
(C) 31
(D) 32
(E) 44


We are given that an appliance store sold an average (arithmetic mean) of 42 microwave ovens per month and that in the first 10 months of this year, the store has sold an average (arithmetic mean) of only 20 microwaves per month.

42 x 12 = 504 microwaves were sold over the course of last year.

10 x 20 = 200 microwaves were sold in the first 10 months of this year.

Thus, the average number of microwaves sold for the 22-month period was:

(504 + 200)/22 = 704/22 = 32

Answer: D
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Re: Last year, an appliance store sold an average (arithmetic mean) of 42 [#permalink] New post   13 Sep 2017, 08:40
SajjadAhmad wrote:
Last year, an appliance store sold an average (arithmetic mean) of 42 microwave ovens per month. In the first 10 months of this year, the store has sold an average (arithmetic mean) of only 20 microwaves per month. What was the average number of microwaves sold per month during the entire 22- month period?

(A) 21
(B) 30
(C) 31
(D) 32
(E) 44


Average during 22 months = 42*12+10*20/22 = 252+100/11 = 352/11 =32

Ans:D
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Re: Last year, an appliance store sold an average (arithmetic mean) of 42 [#permalink]
13 Sep 2017, 08:40
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