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A certain electric-company plan offers customers reduced rates for ele

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Math Expert
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A certain electric-company plan offers customers reduced rates for ele  [#permalink]

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New post 23 Nov 2015, 13:06
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

85% (01:49) correct 15% (01:58) wrong based on 61 sessions

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Marshall & McDonough Moderator
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Re: A certain electric-company plan offers customers reduced rates for ele  [#permalink]

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New post 23 Nov 2015, 21:28
Number of hours between 8 PM to 8 AM = 12
Number of hours with reduced rates = (12*5)+(24*2)
Hours with reduced rates/Total number of hours in a week = (12*5)+(24*2)/(24*7) = 108/(24*7) = 9/14

Answer: C
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Re: A certain electric-company plan offers customers reduced rates for ele  [#permalink]

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New post 25 Nov 2015, 12:42
Bunuel wrote:
A certain electric-company plan offers customers reduced rates for electricity used between 8 p.m. and 8 a.m. weekdays

Reduced rate per day is for 12 hours
Reduced rate for weekdays is for 60 hours (12 hours * 5 days)

Bunuel wrote:
and 24 hours a day Saturdays and Sundays.


Reduced rate for weekends is for 48 hours (24 hours * 2 days)

Bunuel wrote:
Under this plan, the reduced rates apply to what fraction of a week?


Reduced rates apply to the fraction of the week is = Total hours at reduced rate / Total hours in the week

Reduced rates apply to the fraction of the week is = (60+48) / (24*7)

Reduced rates apply to the fraction of the week is = 108 / (24*7) => = 9/14
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Re: A certain electric-company plan offers customers reduced rates for ele  [#permalink]

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New post 03 Aug 2019, 15:49
Bunuel wrote:
A certain electric-company plan offers customers reduced rates for electricity used between 8 p.m. and 8 a.m. weekdays and 24 hours a day Saturdays and Sundays. Under this plan, the reduced rates apply to what fraction of a week?

(A) 1/2
(B) 5/8
(C) 9/14
(D) 16/21
(E) 9/10


Let's just say week is made of 14 units of 12 hours instead of 7 units of 24 hours.
Keeping this in mind, you are given discounted rate for 5(weekday)+4(weekend) that is 9 units out of 14 units of the week
So answer is 9/14
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Re: A certain electric-company plan offers customers reduced rates for ele   [#permalink] 03 Aug 2019, 15:49
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