Your pharmacy stocks solution 'Q' in an 8oz concentrated bottle. Solution 'Q' is usually ordered in 8%. Consequently, your stock bottles are diluted with 16oz of distilled water to prepare 24oz of 8% solution 'Q' in a 1L glass beaker. What is the concentration of the stock bottle?

24%

Explanation:

Given that :

a pharmacy stocks solution 'Q' in an 8oz concentrated bottle

Let the solution Q be = V

so (8oz × V%)  ------   Equation 1

Consequently, the stock bottles are diluted with 16oz of distilled water to prepare 24oz of 8% solution 'Q' in a 1L glass beaker.

that means since 16oz is added to the previous concentration of 8oz which gives 24oz in 8% solution Q; we have

(24oz × 8%) ------ Equation 2

Equation equation 1 and 2 together; we have:

(8oz × V) = (24oz × 8%)

V =

V = 3 × 8%

V = 24%

∴ the concentration of the stock bottle = 24%

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.