In a DNA strand, 80% of the strand is made up of adenine and thymine. How much adenine, thymine, cytosine, and guanine is made up in the strand

The perecentage of guanine is 30%

Explanation:

According to the Chargaff's rules the DNA from any cell of all organisms should have a 1:1 ratio (base Pair Rule) of purine bases [for the DNA cytosine, thymine and for the RNA uracil] and pyrimidine bases [guanine and adenine for RNA and DNA]. The amount of guanine should be equaled to cytosine and the amount of adenine should be equaled to thymine. You can follow this rule in both strands of the DNA.

Explanation:

I don't know about the others sorry!