Boron has two isotopes, B-10 and B-11. The average atomic mass of boron is found to be 10.80u. Calculate the percentage of abundance of these isotopes.

Explanation

To calculate the percentage abundance of the isotopes B-10 and B-11 of boron, we can follow these steps:

### Step 1: Define Variables
Let:
- \( x \) = percentage abundance of B-10
- \( 100 - x \) = percentage abundance of B-11

### Step 2: Write the Equation for Average Atomic Mass
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