$\"\"$

\

$\"\"$ varies jointly as $\"\"$ and $\"\"$ .

\

Find $\"\"$ when $\"\"$ and $\"\"$ .

\

If $\"\"$ when $\"\"$ and $\"\"$ .

\

Consider the values as $\"\"$ and $\"\"$ .

\

Find $\"\"$ .

\

$\"\"$ (Joint variation)

\

$\"\"$ (Substitute $\"\"$ and $\"\"$ )

\

$\"\"$ (Cross multiply)

\

$\"\"$ (Simplify)

\

$\"\"$ (Divide each side by $\"\"$ )

\

$\"\"$ (Cancel common term)

\

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

\

When $\"\"$ and $\"\"$ and $\"\"$ .