Ashley is digging for rocks at a geological site. she has 140 meters of rope and 4 steaks to mark off a rectangular area which set of dimensions will create a rectangle using all of the rope ashley has with her?

10 by 60 Would create a rectangle, so would 20 by 50, so would 30 by 40. These would all create rectangles, but the most like a rectangle would be 10 by 60, or 20 by 50. 
10x2=20 60x2=120 120+20=140
20x2=40 50x2=100 100+40=140

Then why is the question on here if you know the answer