A group of students planned to complete a construction work in 60 days. out of them 5 students could not come and the work was completed in 80 days. what was the total number of students in the beginning?
[A] 64
[C] 48
[B] 20
[D] 72

• let total no of students =x
  x student 1 day's work=1/60
  1 student 1 day's work=1/60x
  since 5 student could not come so x-5 student 1 day's work=1/80
  1 student 1 day's work=1/80(x-5)
  so 1/60x=1/80(x-5)
  => 20x=400
  so x=20
• 11 years agoHelpfull: Yes(14) No(0)
• x*60=(x-5)*80=20 students
• 10 years agoHelpfull: Yes(11) No(0)
• option c x=20
  
• 10 years agoHelpfull: Yes(1) No(4)