Question

It takes 18 electricians 35 days to wire a new housing subdivision. how many days would 28 electricians require to do the same job?

Answer 1

22.5

Explanation:

Answer 2

let
x----------> number of electricians
y---------> number of days to do the job

we know that
y=k/x
k is the constant of variation
for x=18 y=35
35=k/18-----> k=630
so
y=630/x
for x=28
y=630/28----> y=22.5 days

the answer is
22.5 days