Question

fay was assign to make a bookmark and the length of the rectangular bookmark required to her is 20 plus twice its width if the perimeter of the bookmark is 340cm

Answer 1

Is there a question in there somewhere?
2(w + 2w+20) = 340

Answer 2

2 (L + W) = 340 ... L + W = 170

L = 2 W + 20

substituting ... 2 W + 20 + W = 170

solve for W , then substitute back to find L