A double stranded DNA molecule has 20% of cytosine. Using Chargaff's law calculate the percentage of adenine in this DNA molecule?

Explanation

To solve the problem of calculating the percentage of adenine in a double-stranded DNA molecule that has 20% cytosine, we can follow these steps using Chargaff's law.

### Step-by-Step Solution:

1. **Understanding Chargaff's Law**:
Chargaff's law states that in a double-stranded DNA molecule, the amount of adenine (A) is equal to thymine (T), and the amount of cytosine (C) is equal to guanine (G). Therefore, we can write:
- A = T
- C = G
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