need help how to write the steps out for The perimeter of a rectangular photo is 72 cm. The length is twice the width. What are the length and width of the photo? I think the answer is 12l by 24w

Question

johnweldon1993 · Answer

Well lets see...the perimeter is 2L + 2W

the total is 72 so

2L + 2W = 72

We know the length is 2 times the Width...so L = 2W

Sub that into the first equation so

2(2W) + 2W = 72
4W + 2W = 72
6W = 72
W = 12

If the Width is 12 then the Length would be twice that so 

12W by 24L

johnweldon1993 · Answer

You had it all right...just notice it says Length is twice the width

sierra_grey · Answer

okay, thanks so much!

johnweldon1993 · Answer

@Helloimjohn1234 Notice that since Length is twice the width...the 2nd equation needed is L = 2W

johnweldon1993 · Answer

@sierra_grey No problem :)