Question

b) what percent of the total weight represents the combined weight of required saliva and paper shavings?
\\(\frac{x}{100} = \frac{21.0}{21.03}\\)

Explanation:

Step1: Set up the proportion

We have the proportion $\frac{x}{100}=\frac{21.0}{21.03}$, where $x$ is the percentage we want to find.

Step2: Solve for x

Cross - multiply to get $21.03x = 21.0\times100$. Then $x=\frac{21.0\times100}{21.03}$.
Calculate $21.0\times100 = 2100$. Then $x=\frac{2100}{21.03}\approx99.86$ (rounded to two decimal places).

Answer:

Approximately $99.86\%$