If 100ml of solution contains 20mg of drugs, how many milligrams of drugs will be in 500ml solution?

15) A quantity that can assume any value is termed as a variable.

$\text{b. Variable}$

16) Step 1: Determine the total amount of water needed. The patient needs to drink the equivalent of 8 glasses of water.

Step 2: Determine the amount of water per drink. Each drink is $\frac{1}{2}$ glass of water.

Step 3: Calculate the number of times the patient must drink. Number of times = Total glasses needed / Glasses per drink Number of times = $\frac{8 glasses}{\frac{1}{2} glass/drink}$ Number of times = $8 \times 2$ Number of times = $16$

$\text{c. 16 times}$

17) Step 1: Identify the given concentration. 100 ml of solution contains 20 mg of drugs.

Step 2: Set up a proportion to find the amount of drug in 500 ml. Let $x$ be the amount of drug in 500 ml. $\frac{20 mg}{100 ml} = \frac{x mg}{500 ml}$

Step 3: Solve for $x$. $x = \frac{20 mg \times 500 ml}{100 ml}$ $x = 20 mg \times 5$ $x = 100 mg$

$\text{b. 100mg}$

18) The mean of a sample is computed by summing all the data values and dividing the sum by the number of items.

$\text{d. computed by summing all the data values and dividing the sum by the number of items}$