problem solve

Question

the population of birth mountain is 40000 and it is going by 800 per year. the population of hidden valley is 67000 and it is decreasing by 550 per year. how long will it take for both areas to have the same population

Answer 1

make a equation for both the cases

 

P(t)=800t+40000

 

Q(t)= 67000-550t

 

where t is the year

 

equate them and solve for t

 

800t+40000=67000-550t

 

1350t=27000    so t=20

 

it will take 20 years for both to have the same population