Question

12 people can clean office in 3 hr how long would 4 people take

Answer 1

Answer:

Step-by-step explanation:

Inverse variations

12*3=4*X

12*3/4=X

9=X

4 people will take 9 hours

Answer 2

Answer:

12mens take 3 hrs

then 12*3=4*X

36=4X

X=9 ans