Question

Twelve people can clean an office building in 3 hours .how long whould it
take 4 people?​​

Answer 1

Step-by-step explanation:

i think it's twelve hours

Answer 2

Answer:

9 hr....

Step-by-step explanation:

12 people = 3hr

1 people = 3hr×12

4 " =( 3×12)/4

" " = 3×3

9hr