Dylan is recording the types of birds he sees while bird watching in the park. On Day 1, he records seeing 16 different types of birds. On Day 2, his number drops by 25%. On Day 3, he records seeing 3 more types of birds than on Day 2.

Question

What was the percent increase from Day 2 to Day 3?

Enter your answer in the box.

% increase

Answer 1

To find the percent increase from Day 2 to Day 3, let's follow the given steps:

1. Calculate the number of birds seen on Day 2:

   • Day 1: 16 birds
   • Day 2: 25% decrease from Day 1. \[ \text{Decrease} = 0.25 \times 16 = 4 \] \[ \text{Birds on Day 2} = 16 - 4 = 12 \]

2. Calculate the number of birds seen on Day 3:

   • Day 3: 3 more than Day 2. \[ \text{Birds on Day 3} = 12 + 3 = 15 \]

3. Determine the percent increase from Day 2 to Day 3:

   • Increase = Birds on Day 3 - Birds on Day 2 \[ \text{Increase} = 15 - 12 = 3 \]

   • Percent increase formula: \[ \text{Percent Increase} = \left(\frac{\text{Increase}}{\text{Original Value}} \times 100\right) \] \[ \text{Percent Increase} = \left(\frac{3}{12} \times 100\right) = 25% \]

Therefore, the percent increase from Day 2 to Day 3 is \(\boxed{25}%\).