Answer:
The answer to your question is 30
Step-by-step explanation:
DNA is composed of 4 nitrogenous bases: Adenine, Cytosine, Guanine and, Thymine.
These base form pairs, Adenine attach to Thymine and Cytosine attach to Guanine.
If a tiger has 20% Adenine that means it also has 20% of Thymine. Total 40% and the other 60 % are Guanine and Cytosine.
Which means 30% Guanine and 30% Cytosine