Robin can clean 72 rooms in 6 days.
How many rooms can Robin clean in 9 days? pls pls help

108

Step-by-step explanation:

Robin cleans 72 rooms in 6 days,

so he cleans 72 rooms / 6 days = 12 (rooms /day),

so 9 days he could clean (12 rooms / day) * (9 days) = 108 rooms

Hello!

Robin can clean 72 rooms in 6 days. How many rooms can Robin clean in 9 days?

We have a proportional magnitude (directly proportional), if we increase the number of days for cleaning, obviously we will have more rooms cleaned, then:

clean rooms days

72 6

y 9

multiply the means by the extremes

108 clean rooms in 9 days  

b.-4 units

all you   do is count how many times you move