Problema Solution
3 people requires 20 days to do a job. How long would it take 4 people to do the same job at the same rate.
Answer provided by our tutors
The rate of the 3 people is : 1/20 (job/days). This means that 1 person can do:
(1/20)(1/3)(job/days)= (1/60) (job/day)
Therefore, 4 people can do:
(1/60)(4)(job/day)=(1/15) job/day
Therefore, it would take 4 people 15 days to do the same job at the same rate.
The rate of the 3 people is : 1/20 (job/days). This means that 1 person can do:
(1/20)(1/3)(job/days)= (1/60) (job/day)
Therefore, 4 people can do:
(1/60)(4)(job/day)=(1/15) job/day
Therefore, it would take 4 people 15 days to do the same job at the same rate.