A postal carrier can deliver to 130 houses in a 2.5 hour period. At this rate, how many hours will it take to deliver to 234 houses?
The postman delivers to 130 houses in 2.5 hours
Divide 130 houses by 2.5 hours and his rate of delivery is 130/2.5 = 52 houses per hour
To deliver to 234 houses, divide 234 by the rate 52 houses/hour and you get 4.5 hours
Tip: the word "per" always means "divide by"
+150 Since he can deliver to 130 houses, in a 2.5 hour period you should
figure out how many he can deliver in 1/2 an hour, which is 26
divide 234 by 26,
and you get 9
9 x 1/2 is equal to 9/2
which is equal to 4.5 hours
