Question

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

Answer 1

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

Answer:

108 clean rooms in 9 days

________________________

Answer 2

108

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