Step 1 :

The shape of the deck is rectangular shape.

The length of the neighbours deck is $\"\"$ .

Consider the width of the neighbours deck is $\"\"$ .

Hence, the area of the neighbours deck is $\"\"$ .

Consider the linear scale factor of raveenas deck is $\"\"$ .

The length of the raveenas deck is $\"\"$ .

The width of the raveenas deck is $\"\"$ .

The area of the raveenas deck is $\"\"$ .

Raveenas deck area is the half of the area of the neighbours deck.

Therefore, $\"\"$ .

$\"\"$

$\"\"$ .

The length of the raveenas deck is $\"\"$ .

Susbtitute $\"\"$ .

$\"\"$

$\"\"$ .

The length of the raveenas deck is $\"\"$ .

Solution:

The length of the raveenas deck is $\"\"$ .