The perimeter of a pool table is 30 ft. The table is twice as long as it is wide. what is the length of the pool table.

Perimeter is legnth + legnth + width + width or

P=2L+2W

L=2W

subsitute L=2W for L in P=2L+2W

P=2 (2W) + 2W

P=4W+2W

P=6W

we know that Perimiter=30 so

30=6W

divide both sides by 6

5=Width

subsitute W=5 for W in L=2W

L=2 (5)

L=10

to check

10=2 (10) + 2 (5)

30=20+10

30=30

checks

Legnght=10

Width=5