If a coral reef ecosystem covers 1500 square kilometers and 20% of it is damaged

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Question: If a coral reef ecosystem covers 1500 square kilometers and 20% of it is damaged, how many square kilometers are still healthy?

Options:

Correct Answer: 1300 km²

Solution:

1500 km² * 0.80 = 1200 km² are still healthy.

If a coral reef ecosystem covers 1500 square kilometers and 20% of it is damaged, how many square kilometers are still healthy?

If a coral reef ecosystem covers 1500 square kilometers and 20% of it is damaged, how many square kilometers are still healthy?

Step 1: Understand that the total area of the coral reef ecosystem is 1500 square kilometers.
Step 2: Determine the percentage of the reef that is damaged, which is 20%.
Step 3: Calculate the damaged area by multiplying the total area by the percentage of damage: 1500 km² * 0.20.
Step 4: Perform the multiplication: 1500 km² * 0.20 = 300 km² (this is the damaged area).
Step 5: To find the healthy area, subtract the damaged area from the total area: 1500 km² - 300 km².
Step 6: Perform the subtraction: 1500 km² - 300 km² = 1200 km² (this is the healthy area).

Percentage Calculation – Understanding how to calculate a percentage of a total area and apply it to find the remaining healthy area.
Basic Arithmetic – Applying multiplication and subtraction to solve problems involving area and percentage.