The fifth grade math problem (a rectangle, the length and width are increased by 2 cm, and the area is increased by 44 square cm. What is the circumference of the original rectangle?
Suppose the width of the original occasion is x cm and y cm.
Now it's x+2cm, y+2cm.
Area increase (x+2)(y+2)-xy=44.
xy+2x+2y+4-xy=44
2x+2y=40
So the circumference is 40 cm.