Q:
      
      
         
            
9 girls working 7 hours a day can complete a piece of work in 15 day. In how many days can 6 girls working for 9 hours a day, complete the same piece of work?
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: B) 17.5 days         
         
Explanation: Let the number of days be 'p' 
As the work is same, we know that
Where M = Men, D = Days, H = Hours per day 
Here M1 = 9, D1 = 15, H1 = 7 
M2 = 6, D2 = p, H2 = 9 
=> 9 x 15 x 7 = 6 x p x 9 
=> p = 35/2 = 17.5 days.
       
      
      
      
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