✅ Answer: 47 days
If the patch doubles in size every day, then on day 48 it covers the whole lake. That means on day 47, it covered HALF the lake — because it doubled once more to fill the rest.
Most people divide 48 by 2 and say 24. But exponential growth doesn’t work like that. This is why most people misunderstand compound interest, virus spread, and population growth.
This question doesn’t test math. It tests whether your brain understands exponential thinking.
Score: __/3
If you have 3/3 so far, you’re in the top 10% of test-takers.
Next: ➡️ Question 4 of 7
