G, P, and S are animal species. What is the average life span, in year, of S?
I. The averagelife span of S is twice that of P and $$\frac{4}{5}$$ that of G.
II. The average life span of G is 30 years longer than that of P and 10 years longer than that of s

if statement I alone is sufficient, but statement II alone is not sufficient to answer the question

if statement II alone is sufficient, but statement I alone is not sufficient to answer the question

if both statements taken together are sufficient to answer the question, but neither statement alone is sufficient

if statements I and II together are not sufficient and additional data is needed to answer the question