Now consider just the second sentence of the multistep word problem.

Sentence 2: If four times the brother's age is subtracted from three times the sister's age, the difference is 16.
Give an equation that represents this statement using b as the age of the brother and s as the age of the sister.
Using your answers from parts B and C, what are the ages of the brother and sister, respectively?

when solving for multiple variables

... you need as many unique equations , as there are unknowns
... in this case , two

at present, there is insufficient information for a solution

This sentence says that:

3s-4b = 16
I assume you have other information from previous parts. Use this and that to find what you need.

This is a chemistry problem? Looks pretty math-y to me.

To represent the given statement algebraically, we can use the following equation:

3s - 4b = 16

In this equation, "s" represents the age of the sister, and "b" represents the age of the brother.

To find the ages of the brother and sister, we need to solve this equation. However, you mentioned parts B and C, which might refer to previous steps or information. Could you please provide the information from parts B and C?