Book
Maths Puzzle
Numerical Ability
Time and Work
9 examiners can examine a certain number of answer books in 12 days by working 5 hours a day. How many hours in a day should 4 examiners work to examine twice the number of answer books in 30 days?
Read Solution (Total 3)
-
- let no. of books being examined be x
x=(No. of examiners)*(No. of days)*(hour of work per day)
x=12*9*5
now
for 4 examiners
hour of work per day be H
2x=4*30*H
H=2*9*12*5/120
H=9 Ans. - 9 years agoHelpfull: Yes(3) No(0)
- 9*12*5=4*30*h
h=4.5 - 9 years agoHelpfull: Yes(1) No(0)
- by CHAIN RULE
MEN DAYS HOURS
9 12 5
4 30 X
9/4*12/30*5/X
BY SOLVING,
X=9/2
TWICE THE NUMBER OF ANSWER BOOK
SO,WE MULTIPLY BY 2.
THEN X=9/2*2=9
ANS IS 9. - 8 years agoHelpfull: Yes(1) No(0)
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