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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?

 Feb 1, 2019
edited by Guest  Feb 1, 2019
 #1
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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"

 Feb 1, 2019
 #2
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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

 Feb 1, 2019

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