$\"\"$

The verbal statement is " $\"\"$ varies inversely as $\"\"$ , the value of $\"\"$ and $\"\"$ ".

$\"\"$ varies inversely as $\"\"$ means that,

$\"\"$

Thus, the mathematical model is $\"\"$ .

Now find the value of k as follows :

Consider $\"\"$ . \ \

Substitute the values of $\"\"$ and $\"\"$ in above equation. \ \

$\"\"$

Multiply each side by 25.

$\"\"$ .

Thus, the mathematical model is $\"\"$ . $\"\"$

The mathematical model is $\"\"$ .