Answer:
49 minutes
Step-by-step explanation:
It would take 49 minutes for 9 people to paint 7 walls.
4 walls need 262 people/minutes (7)(36)
9 people could do that in 49 minutes (441/9)
Answer:
49 minutes
Step-by-step explanation:
first we need to find the rate at which a person paints the walls :
it takes 36 minutes to paint 4 walls by 7 people :
so for 7 people the rate at which they paint the walls is : [tex]\frac{4}{36}[/tex] walls/minute
if we simplify we get [tex]\frac{1}{9}[/tex]
now that was for 7 people , for 1 person the rate is : [tex]\frac{1}{9} \frac{1}{7}[/tex] which is [tex]\frac{1}{63} walls / minute[/tex]
now we have the rate for one person
so for 9 people they will paint [tex]\frac{9}{63} =\frac{1}{7}[/tex] walls/minute
so it takes them 7 minute to paint 1 wall
which means it takes them 7 x7 = 49 minutes to paint 7 walls
