Answer:
yes . A approximately equals to T and G approximately equals C in average.
Step-by-step explanation:
according to Chargaff's equivalence rule
the number and concentration of adenine is similar to the number of thymine and number of guanine is similar to that of cytosine in the DNA.
so according to conditions given in the question i.e average amount of A should be equal to average amount of T and total average amount of G in every genome on Earth should equal the total average amount of C . so Chargaff's equivalence rules still hold true when you consider those six species together.