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In order to complete a reading assignment on time, Terry

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Re: In order to complete a reading assignment on time, Terry  [#permalink]

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New post 09 Aug 2017, 18:55
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There is really one variable in this question: other unknowns can be derived from the number of days in total Terry has to complete the reading assignment. So let x be that number of days. We have:

90x = Total number of pages = 75(x-6) + 690
So 15x = 240
x = 16

QED.
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Re: In order to complete a reading assignment on time, Terry  [#permalink]

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New post 09 Aug 2017, 19:06
Please correct me if I am wrong,

My thinking is
She has 690 pages left for the last 6 days
She supposed to 540 pages left (since she planned to read 90 pages per day)

690-540= 160 pages behind)

She had been reading 75 pages per day, (90-75= 15 behind every day)
160/15= 10~ days at the beginning
10~days+ the last 6 days = 16
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Re: In order to complete a reading assignment on time, Terry  [#permalink]

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New post 20 Jul 2018, 08:42
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Total Page = 75n + 690
Average is 90
so , [[75n+90]/n+6 ]] = 90
= 75n + 690 = 90n + 540
= 15n = 150
n = 10 days [she read 75 pages per day]
She will require = 10+6 = 16 days.
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Re: In order to complete a reading assignment on time, Terry  [#permalink]

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New post 20 Jul 2018, 09:20
nelz007 wrote:
In order to complete a reading assignment on time, Terry planned to read 90 pages per day. However, she read only 75 pages per day at first, leaving 690 pages to be read during the last 6 days before the assignment was to be completed. How many days in all did Terry have to complete the assignment on time?

(A) 15
(B) 16
(C) 25
(D) 40
(E) 46

Stuck on this question its from OG 13 - 119


Let n be the total number of Days.

90n = 75(n-6) + 690
n = 16.
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Re: In order to complete a reading assignment on time, Terry &nbs [#permalink] 20 Jul 2018, 09:20

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