The patient is to take 1,500 mg PO daily of Medication Q. The pharmacy dispenses a bottle of Medication Q labeled "750 mg tablets." The nurse sets up the following proportion:

750 mg: 1 tablet :: 1,500 mg: x tablet

Which of the following represents the correct multiplication of the means and extremes?

750 x 1,500 = 1 xX

1 x 1,500 = 750 × X

1 x x = 750 × 1,500

Answer and Explanation

The Correct Answer is C

A. 750 x 1,500 = 1 x X: This incorrectly multiplies the known dose by the desired dose without following the proper proportion rule of means and extremes.

B. 1 x 1,500 = 750 × X: This setup places the number of tablets on the wrong side of the equation, making the calculation incorrect.

C. 1 x x = 750 × 1,500: This correctly applies the rule of means and extremes, multiplying the means (1 and 1,500) and extremes (750 and x) to solve for the unknown number of tablets.

D. 750 x 1 = 1,500 x x: This reverses the proportion setup and does not accurately solve for x, leading to an incorrect calculation

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Correct Answer is B

Explanation

Calculation:

Given dose = 325 mg

Conversion factor: 1 gram (g) = 1,000 milligrams (mg)

Calculate the dose in grams (g).

Dose (g) = (Dose in mg / Conversion factor)

= (325 mg / 1,000 mg/g)

= 0.325 g.

A. 15 mL = 3 tsp/1 tbsp B. 10 mL = 2 tsp C. 30 mL = 6 tsp D. 30 mL = ½ OZ

Correct Answer is D

Explanation

A. 15 mL = 3 tsp/1 tbsp: This is a correct conversion. One teaspoon equals 5 mL, so 3 teaspoons equal 15 mL, which also equals 1 tablespoon. This measurement is accurate and safe for patient use.

B. 10 mL = 2 tsp: One teaspoon equals 5 mL, so 2 teaspoons equal 10 mL. This conversion is correct and aligns with standard household equivalents.

C. 30 mL = 6 tsp: Six teaspoons multiplied by 5 mL per teaspoon equals 30 mL. This conversion is accurate and does not require questioning.

D. 30 mL = ½ OZ: One ounce equals 30 mL, so ½ ounce equals 15 mL, not 30 mL. This conversion is incorrect and could result in a doubling of the prescribed dose, making it unsafe.

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The patient is to take 1,500 mg PO daily of Medication Q. The pharmacy dispenses a bottle of Medication Q labeled "750 mg tablets." The nurse sets up the following proportion:

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Naxlex Comprehensive Predictor Exams

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