Aptitude Test for Teachers

Q.  If a tank can be build by 18 men in 28 days while working for 9 hours per day, how many hours per day do 21 men have to work for 36 days, to complete the same tank?

a. 4
b. 5
c. 9
d. 6


ANSWER: See Answer
 
No explanation is available for this question!
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