Suppose $\frac ab = \frac35$,$\frac bc=\frac{15}6$, and $\frac cd = 6$. What is the value of $\frac ad$? Express your answer in simplest form.
Multiply all the ratios together:
\((\frac{a}{b})(\frac{b}{c})(\frac{c}{d}) = \frac{a}{d}\)
Hope this gets you started.