Question

The fish population at a local lake has been exposed to a dangerous virus. Before the outbreak, there were 310 fish in the lake. Now each week, half of the fish die from the virus. How many fish will remain after 7 weeks?
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1 point
About 10 fish
About 6 fish
About 2 fish
No fish

Answer 1

To calculate the remaining population of fish after each week, we start with the initial population of 310 fish. Each week, half of the fish die, which means the population is halved each week.

Let's break it down week by week:

- **Week 0:** 310 fish
- **Week 1:** \(310 / 2 = 155\) fish
- **Week 2:** \(155 / 2 = 77.5\), but since we can't have half a fish, we round down to 77 fish
- **Week 3:** \(77 / 2 = 38.5\), round down to 38 fish
- **Week 4:** \(38 / 2 = 19\) fish
- **Week 5:** \(19 / 2 = 9.5\), round down to 9 fish
- **Week 6:** \(9 / 2 = 4.5\), round down to 4 fish
- **Week 7:** \(4 / 2 = 2\) fish

After 7 weeks, there will be **2 fish** remaining in the lake.

So the correct answer is **About 2 fish**.