Bryans rectangular kitchen has an area of 81 ft.² the kitchen is nine times as many square feet as brian's pantry if the rectangle or pantry is 3 feet wide what is the length of the pantry

The length of the pantry is 3 feet.

You start by dividing 81 by 9 since the pantry's area is 9 times the area of the whole kitchen. Then you divide the area of the pantry (which is 9 because 9 times 9 is 81) by 3 since length times width equals the area. You get 3 feet in the end.

Hope this helped :)