Question 293101
L=W+7
P=2L+2W
210=2(W+7)+2W
210=2W+14+2W
210=4W+14
4W=210-14
4W=196
W=196/4
W=49 ANS. FOR THE WIDTH.
L=49+7=56 ANS. FOR THE LENGTH.
PROOF:
210=2*56+2*49
210=112+98
210=210