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Body mass index (BMI) is directly proportional to a person’s weight in pounds and inversely proportional to the square of a person’s height in inches. A person with a BMI of 23.91 has a weight of 135 pounds and a height of 63 inches. Rounded to the nearest hundredth, what is the BMI of a person with a weight of 145 pounds and a height of 65 inches?

Answer :

The BMI of a person weighing 145 pounds with a height of 65 inches is approximately 24.13, calculated using the BMI formula in pounds and inches.

To find the Body Mass Index (BMI) of a person with a weight of 145 pounds and a height of 65 inches, we can use the following relationship:

The formula for BMI in pounds and inches is: BMI = [703 x weight (lbs)] / [height (in)]²

First, we calculate the BMI for a weight of 135 pounds and height of 63 inches to determine the proportionality constant (k).

BMI = [703 x 135] / 63²

Given that BMI = 23.91 for these values:

  • 23.91 = 703 x 135 / 3969
  • 23.91 = 94905 / 3969
  • 23.91 = 23.91 (This confirms our given value)

Now, we will calculate the BMI for the new weight and height:

  • BMI = [703 x 145] / 65²
  • BMI = 703 x 145 / 4225
  • BMI = 101935 / 4225

BMI ≈ 24.13 (rounded to the nearest hundredth)

Therefore, the BMI of a person with a weight of 145 pounds and height of 65 inches is approximately 24.13.

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