If 9 examiners can examine a certain number of answer books in 12 days, working
5 hours a day; for how many hours a day would 4 examiners have to work in order
to examine twice the number of answer books in 30 days ?
a) 6
b) 8
c) 9
d) 10
Answers
Given : 9 examiners can examine a certain number of answer books in 12 days, working 5 hours a day;
To Find : for how many hours a day would 4 examiners have to work in order to examine twice the number of answer books in 30 days
a) 6
b) 8
c) 9
d) 10
Solution:
9 examiners can examine a certain number of answer books in 12 days, working 5 hours a day;
Hence 9 * 12 * 5 = 540 Man hrs required to do work
twice the number of answer
Hence work = 2 * 540 = 1080 Man hrs
Examiners = 4
Days = 30
Numbers of hrs daily = x
Total Man hrs = 4 * 30 * x = 120x Man hrs
Equate man hrs
120x = 1080
=> x = 9
Hence 9 hrs a day to be worked
Option c) 9 is correct
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Answer:
Option C is the correct answer.