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A certain barrel is 1/5fff\(\frac{1}{5}\)/ffffull. When k liters of liquid are added to the barrel, it becomesfff\(\frac{2}{3}\)/fff 2/3full. In terms of k, what is the capacity of the barrel, in liters?
A.fff\((\frac{3}{8})k\)/fff
B.fff\((\frac{7}{15})k\)/fff
C.fff\((\frac{15}{7})k\)/fff
D.fff\((\frac{7}{3})k\)/fff
E.fff\((\frac{8}{3})k\)/fff
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