1. (E) There isn't sufficient information to solve 2 variables, the rate of interest & the time for which the interest is calculated.
2.(C) Combining I & II the average of the 3 numbers is 20.
What are the correct answer choices?
Concerning #2, why is the average 20?
The two statements taken together say that the possible sums of k,l,and m can be 58-62.
I would say the answer is E.