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Acres of Pizzas (pizzas are round)

It is estimated that Americans eat 100 acres worth of pizza a day. Assume that they are large pizzas with a diameter of 14 inches.

  • Find the number of square inches in a large pizza.
  • An acre has 43,560 square feet and a square foot has 144 square inches. How many square inches are there in 100 acres?
  • How many large pizzas do Americans eat each day?
  • If a large pizza has eight slices, estimate how many slices per second American eat.

What is another real world situation in which similar calculations are used?

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The number of square inches in a pizza with a diameter of 14 inches equals 153.94 inches squared.

There are 43,560 square feet in an acre and 144 square inches in a square foot. Therefore, 43,560×144=6,272,640 square inches in an acre. 6,272,640×100=627,264,000 square inches in 100 acres.

627,264,000 square inches in 100 acres divided by 153.94 square inches per pizza. Therefore, americans eat 4,074,730.414 pizza’s every day.

There are 86400 seconds in a day, since there are 4,074,730.414 pizza’s eaten everyday, divide that by 86400 which equals 47.16 pizza’s every second. Then multiply that by 8 to get 377.28 slices of pizza eaten every second in the USA.

Another example is – Americans used 140.43 billion gallons of gasoline in 2015. How many pounds of gasoline were used per american? Assuming the average MPG per car in the USA was 24.8, how many miles did americans travel?


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