Solve
-To Trim the Edges of a Rectangular Table Cloth $10 \mathrm { ft }$

Solve.
-To trim the edges of a rectangular table cloth, 30 feet of lace are needed. The length of the table cloth is exactly one-half its width. What are the dimensions of the table cloth?

A) length: $10 \mathrm { ft }$ ; width: $5 \mathrm { ft }$
B) length: $5 \mathrm { ft }$ ; width: $10 \mathrm { ft }$
C) length: $2 \frac { 1 } { 2 } \mathrm { ft }$ ; width: $5 \mathrm { ft }$
D) length: $10 \mathrm { ft }$ ; width: $20 \mathrm { ft }$