gross is identically grows daily.. if 60 cows are eaten the gross means it takes 24 days. and 30 cows means 70 days.. how many cows needed for 96 days?

• If x is initial grass and y is daily consumption of each cow and z is daily growth of grass, then
  x+24z= 24*60*y
  x+70z= 30*70*y
  If c no. of cows needed for 96 days, then
  x+96z= c*96*y
  
  solving these eqns, we get
  c=20 cows
• 10 years agoHelpfull: Yes(4) No(3)