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14 Jul 2020, 03:57
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
91% (01:04) correct
9%
(01:22)
wrong
based on 111
sessions
History
Date
Time
Result
Not Attempted Yet
Professor Davis can write a book manuscript in 5 days. His graduate student Miguel can write the same manuscript in 10 days. After working alone for 3 days, Professor Davis was called away on urgent business, which left Miguel alone to finish the manuscript. How many days did it take Miguel to finish it?
A. 2
B. 3
C. 4
D. 5
E. 6
A. 2
B. 3
C. 4
D. 5
E. 6
yashikaaggarwal
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14 Jul 2020, 07:38
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Professor Davis can write a book manuscript in 5 days.
His graduate student Miguel can write the same manuscript in 10 days.
LCM of 5&10 = 10
So professor does 2 part of work per day.
And student does 1 part of work every day.
After working alone for 3 days, Professor Davis was called away on urgent business, he completed 3*2 = 6 parts own his own.
which left Miguel alone to finish the manuscript or 10-6=4 part of work
Which Miguel will do in 4 days.
IMO C
Posted from my mobile device
His graduate student Miguel can write the same manuscript in 10 days.
LCM of 5&10 = 10
So professor does 2 part of work per day.
And student does 1 part of work every day.
After working alone for 3 days, Professor Davis was called away on urgent business, he completed 3*2 = 6 parts own his own.
which left Miguel alone to finish the manuscript or 10-6=4 part of work
Which Miguel will do in 4 days.
IMO C
Posted from my mobile device
Archit3110
Major Poster
14 Jul 2020, 09:16
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Bunuel
Rate of Prof D ; 1/5
so in 3 days he must have finished ; 3x/5 book ; left with 2x/5 book
which Rate of Miguel ; 1/10
would be finished in
2x/5 = 1/10 ; x= 1/4 ; 4 days
OPTION C
