Answer:
10
Step-by-step explanation:
So the answer is 11/2 .
8000
P= 2(l+w)
50=2(10+w)
50=20+2w
50-20=2w
30=2w
w=15
142 3/8
45 + 42 = 87
87 + 54 = 141
7/8 + 3/8 = 1 2/8
1 + 141 = 142
2/8 + 1/8 = 3/8