Is there an easier way to solve the following problem without going through 100 guesses trying to find two numbers that total de area and the perimeter. ps I'm the mom trying to explain to my kid

Question

The perimeter of a rectangular banner is 72 inches.  The width of the banner is 1/3 it's length what is the area of the banner ?  27 and 9. Area is 243

Thanks for your help

Ms. Sue · Answer

P = 2L + 2W 72 = 2L + 2(1/3)L 72 = 2 2/3L 72 = (8/3)L 72/(8/3) = L 72 * (3/8) = L 216/8 = L 27 = L

Lilly · Answer

Thanks. The teacher has not taught division that is the problem. I don't get how else they can get the answer without dividing is there another way. This is crazy

Ms. Sue · Answer

I don't know. I suggest you make an appointment and talk with the teacher. The teacher may have another method.