Step 1:

$\"\"$ varies directly with $\"\"$ , then $\"\"$ .

When $\"\"$ , the value of $\"\"$ is $\"\"$ .

Substitute $\"\"$ and $\"\"$ in $\"\"$ .

$\"\"$

$\"\"$ .

Find the value of $\"\"$ when $\"\"$ .

Substitute $\"\"$ and $\"\"$ in $\"\"$ .

$\"\"$

$\"\"$ .

The value of $\"\"$ when $\"\"$ is $\"\"$ .

Solution:

$\"\"$ .