If a double stranded DNA has 20% of cytosines, calculate the percent of adenine in the DNA.

Explanation

To solve the problem of calculating the percentage of adenine in a double-stranded DNA that has 20% cytosine, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Base Pairing Rules**: In double-stranded DNA, the amount of cytosine (C) is equal to the amount of guanine (G), and the amount of adenine (A) is equal to the amount of thymine (T). This is known as Chargaff's rules.

2. **Identify Given Information**: We are given that the percentage of cytosine (C) is 20%.

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