Question

5person can finish a certain work with n 4 days how many person are needed to finish it in 2 days​

Answer 1

To do the job in 2 days u need an unknown number for the person,I'll number it as p

p x 2 days = 20 people days

p = 10 people

using 10 people u can do the job in 10 days

answer= 10 days checking if it's correct plugging

p in equation p x 2= 20

hope it's helpful (θ‿θ)

Answer 2

No need the building is already built