Question

The width of David's tent is 5 feet the length is twice the width Davids air mattress measures 3 feet by 6 feet how many square feet of floor space will be available for the rest of his things

Answer 1

If the length is twice the width, means length is : $2\quad \times \quad 5\quad =\quad 10$
To find the area multiply the width and length :$10\quad \times \quad 5\quad =\quad 50$ . The air mattress' area is $3\quad \times \quad 6\quad =\quad 18$ We should substract the air matress' field from the tent's : $50\quad -\quad 18\quad =\quad 32$ The answer is 32 square feet.