Respuesta :

calculista
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

Answer:

22.5

Step-by-step explanation: