SOLUTION: A rectangular picture frame is twice as long as it is wide,if the perimeter is 30cm what is its length?

Algebra ->  Rectangles -> SOLUTION: A rectangular picture frame is twice as long as it is wide,if the perimeter is 30cm what is its length?       Log On


   

Question 705751: A rectangular picture frame is twice as long as it is wide,if the perimeter is 30cm what is its length?

Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
L=2W
P=2L+2W
30=2*2W+2W
30=4W+2W
30=6W
W=30/6
W=5 cm. ANS.
L=2*5=10 cm. ANS.
PROOF:
30=2*10+2*5
30=20+10
30=30