The area of a rectangular field is equal to 300 square meters. Its perimeter is equal to 70 meters. Find the length and width of this rectangle.	Choices:
A) w = 15 and l = 20	B) w = 25 and l = 30	C) w = 35 and l = 40	D) w = 45 and l = 50	E) w = 55 and l = 60

Rationale: l * w = 300 : area , l is the length and w is the width . 2 l + 2 w = 70 : perimeter l = 35 - w : solve for l ( 35 - w ) * w = 300 : substitute in the area equation w = 15 and l = 20 : solve for w and find l using l = 35 - w . correct answer a
Answer: A