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9) When an algal bloom occurs in a body of water, the chlorophyll concentration is at its highest. The table below shows the chlorophyll concentration in a body of water at 15-day intervals for 60 days after the algal bloom peaks.

\begin{tabular}{|r|r|}
\hline
\begin{tabular}{c}
Days after \\ algal bloom \\ begins
\end{tabular}
&
\begin{tabular}{c}
Chlorophyll \\ concentration \\ (grams per liter)
\end{tabular} \\
\hline 0 & 180 \\
\hline 15 & 80 \\
\hline 30 & 36 \\
\hline 45 & 16 \\
\hline 60 & 6 \\
\hline
\end{tabular}

According to the table, how many more grams of chlorophyll are present in a 5-liter water sample taken 15 days after the algal bloom begins than are present in a 9-liter sample taken 45 days after the algal bloom begins?

Sagot :

GinnyAnsweridn
To analyze how many more grams of chlorophyll are present in different water samples taken at different times after an algal bloom, let's break down the problem step-by-step:

1. Identify Chlorophyll Concentration:
- At 15 days after the algal bloom, the chlorophyll concentration is 80 grams per liter.
- At 45 days after the algal bloom, the chlorophyll concentration is 16 grams per liter.

2. Identify Sample Sizes:
- For the sample taken at 15 days, the sample size is 5 liters.
- For the sample taken at 45 days, the sample size is 9 liters.

3. Calculate the Amount of Chlorophyll in Each Sample:
- For the 15-day sample:
- Amount of chlorophyll = concentration sample size
- Amount of chlorophyll = 80 grams/liter 5 liters
- Amount of chlorophyll = 400 grams
- For the 45-day sample:
- Amount of chlorophyll = concentration sample size
- Amount of chlorophyll = 16 grams/liter 9 liters
- Amount of chlorophyll = 144 grams

4. Calculate the Difference in Chlorophyll Amounts:
- Difference = amount in 15-day sample - amount in 45-day sample
- Difference = 400 grams - 144 grams
- Difference = 256 grams

Therefore, there are 256 more grams of chlorophyll in a 5-liter water sample taken 15 days after the algal bloom begins compared to a 9-liter sample taken 45 days after the algal bloom begins.
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