Answer:
15+12+8+7+7+5=54
Explanation:
54
why 54?
there are two missing distances
so we see the two heights
12-5=7
and now the two lengths
15-8=7
now we got the missing lengths, and we add them
54 is the answer
54ft
15- 8 = 7ft
12-5 = 7ft
7+7+12+15+5+8 = 54 ft
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