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.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
9
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.
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