Question

The length of a rectangle is twice as large as its width, and its perimeter is `210` `m`. What are the length and width of the rectangle?

Answer 1

The perimeter of a rectangle is `2l+2w`. Since we know `l=2w` we can substitute that in: `2(2w)+2w=4w+2w=6w`.

So `6w=210`, then `w=210/6=35` `m`, and the length is twice that, `70` `m`.