If a + 2b = 6 and ab = 4, then what is 2/a + 1/b = ?

Answer: Option C

$$\begin{array}{rl}& \frac{2}{a}+\frac{1}{b}\\ & =\frac{2b+a}{ab}\\ & =\frac{6}{4}\\ & =\frac{3}{2}\end{array}$$