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Roger can read a book in k minutes. What part of the book can he read
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21 May 2021, 09:40
21 May 2021, 09:40
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Roger can read a book in k minutes. What part of the book can he read in 8 minutes? (k>8)
A) 8+k
B) 8/k
C) k/8
D) (k+ 8)/k
E) (k-8) / k
A) 8+k
B) 8/k
C) k/8
D) (k+ 8)/k
E) (k-8) / k
Senior Manager
Joined: 23 Jan 2021
Posts: 294
Given Kudos: 81
Concentration: , International Business
Re: Roger can read a book in k minutes. What part of the book can he read
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21 May 2021, 18:24
21 May 2021, 18:24
This question is based on simple unitary method.
Paraphrasing a book into 1 book,
roger can read 1 book in k minutes.
'' '' '' 1/k parts of book in 1 minute.
'' '' '' 1/k *8 parts of book in 8 minute.
Hence ans is 8/k .
Paraphrasing a book into 1 book,
roger can read 1 book in k minutes.
'' '' '' 1/k parts of book in 1 minute.
'' '' '' 1/k *8 parts of book in 8 minute.
Hence ans is 8/k .
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Joined: 10 Apr 2015
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Re: Roger can read a book in k minutes. What part of the book can he read
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22 May 2021, 05:07
22 May 2021, 05:07
2
Carcass wrote:
Roger can read a book in k minutes. What part of the book can he read in 8 minutes? (k>8)
A) 8+k
B) 8/k
C) k/8
D) (k+ 8)/k
E) (k-8) / k
A) 8+k
B) 8/k
C) k/8
D) (k+ 8)/k
E) (k-8) / k
One approach is the input-out approach.
Let's say k = 24
That is, it takes 24 minutes to read the entire book.
So, in 8 minutes, Roger can read 1/3 of the book
So, we're looking for the answer choice that yields an OUTPUT of 1/3 when k = 24
A) 8+24 = 32 ELIMINATE
B) 8/24 = 1/3 KEEP
C) 24/8 = 3 ELIMINATE
D) (24+ 8)/24 = 32/24 = 4/3 ELIMINATE
E) (24-8) / 24 = 16/24 = 2/3 ELIMINATE
Answer: B
Cheers,
Brent
