A school janitor has mopped 1/3 of a classroom in 5 minutes. At what rate is he mopping?

1/15 classrooms per minute

Step-by-step explanation:

Find the janitor's rate in classrooms per minute. Divide

1/3

of a classroom by 5 minutes.

To divide by 5, multiply by its reciprocal, 1/5

.

1/3 ÷5 = 1/3 * 1/5 = 1/15

The janitor is mopping at a rate of 1/15 of a classroom per minute.

b.) 160 miles on a 5 gallons car

step-by-step explanation:

240/10=24 miles/gallon

160/5=32 miles/gallon

30/1=30 miles/gallon

168/6= 28 miles/gallon

32 miles/gallon is the most amount, so this is the best.