How many adenine, thymine and cytosine nucleotides (separately) are contained in a fragment of a DNA molecule, if 300 guanine

How many adenine, thymine and cytosine nucleotides (separately) are contained in a fragment of a DNA molecule, if 300 guanine nucleotides are found in it, which make up 20% of the total number of nucleotides in this fragment of a DNA molecule? How long is this piece of DNA?

Answer: C = G = 20% – 300 nucleotides each; A = T = 30% – 450 nucleotides each; length: 2550A

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