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# Mr.Hock feeds grains to sparrows every morning. On the first day,

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Joined: 25 Dec 2018
Posts: 145
Location: India
GMAT 1: 490 Q47 V13
GPA: 2.86
Mr.Hock feeds grains to sparrows every morning. On the first day,  [#permalink]

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14 Jan 2019, 01:17
1
3
00:00

Difficulty:

15% (low)

Question Stats:

78% (01:25) correct 22% (01:37) wrong based on 57 sessions

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Mr.Hock feeds grains to sparrows every morning. On the first day, he fed 20 sparrows and every next day after the first he fed to be 12 more than that on the previous day. If he fed 128 sparrows on the nth day, what is the value of n?

A. 8
B. 9
C. 10
D. 11
E. 12
Director
Status: Manager
Joined: 27 Oct 2018
Posts: 681
Location: Egypt
GPA: 3.67
WE: Pharmaceuticals (Health Care)
Mr.Hock feeds grains to sparrows every morning. On the first day,  [#permalink]

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14 Jan 2019, 01:29
1
it compose an arithmetic sequence (20,32,44,...)

128 = 20 + (n-1)*12

n = 10

(C)
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Thanks for Kudos
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 9706
Location: Pune, India
Re: Mr.Hock feeds grains to sparrows every morning. On the first day,  [#permalink]

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14 Jan 2019, 04:47
akurathi12 wrote:
Mr.Hock feeds grains to sparrows every morning. On the first day, he fed 20 sparrows and every next day after the first he fed to be 12 more than that on the previous day. If he fed 128 sparrows on the nth day, what is the value of n?

A. 8
B. 9
C. 10
D. 11
E. 12

1st Day - 20
2nd Day - 20 + 12
3rd Day - 20 + 2*12
...
nth Day - 128 = 20 + (n-1)*12

128 = 20 + (n - 1)*12
n = 10

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Karishma
Veritas Prep GMAT Instructor

Re: Mr.Hock feeds grains to sparrows every morning. On the first day,   [#permalink] 14 Jan 2019, 04:47
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