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kelis2

Open Questions

can you please help?

A student eats 3 hamburgers in 15 min. What is the rate in hamburgers per minute? In minutes per hamburger?

The heart of a human, at rest, will beat an average of 4200 beats in 60 min. What is the rate in beats per minute?

The continent of Australia, with the island state of Tasmania, has an area of 2,967,893 sq mi and a population of 19,913,144 people. What is the rate of number of people per square mile? The rate per square mile is called the population density. Australia has one of the lowest population densities in the world.

Posted 162 day ago

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Answers (4)

samzappala

1. 3 hamburgers in 15 minutes = 1 in 5 minutes = .2 or 20% or 1/5 in 1 minute. 5 minutes per hamburger.

2. 4200/60=420/6=70 beats per minute. (Break it down).

3. Divide: 19,913,144/2,967,893=6.709522 or 6.71/mile. Remember to divide the way you're asked.

Posted 161 day ago

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albert29

First question: To get the rate of hamburgers per minutes divide the number of hamburgers by the time in minutes or (3 hamburgers/15 minutes) = 0.2 hamburgers per minutes.

Then to get minutes per hamburger divide the minutes by the amount of hamburgers or (15 Minutes/3 hamburgers) =5 minutes per hamburger.

The second question. To get the beats per minute divide the beats by the number of minutes or (4200 beats/60 minutes) = 70 beats per minutes. That sounds like a resting heart rate. I know when I start exercising mine is in the 80s. When I exercise it gets around 120.

Third question. To get the number of people for sqaure mile divide the number of people by the number of squre miles or (19,913,144 people)/(2,967,893 square miles) = 6.7095 people per square mile or roughly 6.71

Posted 161 day ago

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matherapist

one hamburg in 5 minutes (see first answer) is 1/5 of a hamburg per minute. The other answers are correct.

Posted 162 day ago

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MichaelT

15/3 = 5 Therefore, the student will eat one hamburger in 5 minutes.

4200/60 = 70 beats per minute.

19913144/ 2967893 = 6.71 Since you need to round up to the nearest person, you'd say 7 people per square mile.

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