Math
posted by Please help .
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?

P = 2(L + W)
Half of 30 is 15.
Take it from there. 
perimeter is adding up all sides so x equals the width and 2x equals the length. x+x+2x+2x=30. so 6x=30, divide 30 by 6= 5, so x=5 which is the width and 2x=10 which is the length.

I don't get what l and w would be

P = 2(L + W)
30 = 2 (2W + W)
30 = 4W + 2W
30 = 6W
30/6 = W
5 = W
Now find the length.