If 20 men can build a wall 56 meters long in 6 days, what length of a similar wall can be built by 35 men in 3 days ?

• it can be solved by counting manday
  56 meter wall is made = 20 x 6 = 120 mandays
  120 mandays made a wall = 56 meter
  1 mandays made a wall = 56/120 meter
  (35 x 3) mandays made a wall = (56/120) x (35 x 3) = 49 meter (answer)
• 12 years agoHelpfull: Yes(4) No(1)
• Let the required length be x meters
  More men, More length built (Direct proportion)
  Less days, Less length built (Direct Proportion)
  Men
  20:35
  Days
  6 : 3
  }⋮⋮ 56 :x
  Men20:35Days6 : 3⋮⋮ 56 :x
  
  => (20 x 6 x X)=(35 x 3 x 56)
  => x = 49
  Hence, the required length is 49 m.
• 6 years agoHelpfull: Yes(0) No(1)