Problema Solution
the number of workers n required to complete a job varies inversely as the time t spent working. it takes 4 hr for 20 people to raise a barn. how long would it take 25 people to complete the job?
Answer provided by our tutors
n = k/t, where k is constant
t = 4 hr, n = 20 people
20 = k/4
k = 20*4
k = 80
n = 80/t
for n = 25 we have
80/t = 25
t = 80/25
t = 3.2 hr
t = 3 hr 12 min
25 people will complete the job in 3 hr 12 min.