Question 96451
L+2W=60
L=60-2W NOW REPLACE L BY(60-2W) IN THE FIRST EQUATION & SOLVE FOR W
352=(60-2W)W
352=60W-2W^2
2W^2-60W+352=0
2(W^2-30W+176)=0
2(W-22)(W-8)=0
W-8=0
W=8 ANSWER. 
THEN L=60-2*8
L=60-16
L=44 ANSWER.
PROOF
8*44=352
352=352