<|system|>
The operation @ is defined as $\frac{m}{n}@\frac{p}{q} = (m)(p)\left(\frac{q}{n}\right)$ for simplified fractions $\frac{p}{q}$.  What is the simplified value of $\frac{7}{30}@\frac{10}{21}$?</s>.
<|user|>
Can you answer based on context?
<|assistant|>
We have $\frac{7}{30}@\frac{10}{21}=(7)(10)\left(\frac{21}{30}\right)=49$.