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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: 148
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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New post 14 Jan 2019, 01:17
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  25% (medium)

Question Stats:

75% (01:27) correct 25% (01:45) wrong based on 42 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
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Joined: 27 Oct 2018
Posts: 207
Location: Malaysia
Concentration: Strategy, International Business
GPA: 3.67
WE: Pharmaceuticals (Health Care)
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Mr.Hock feeds grains to sparrows every morning. On the first day,  [#permalink]

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New post 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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Re: Mr.Hock feeds grains to sparrows every morning. On the first day,  [#permalink]

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New post 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

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

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