The missing length is 319 feet. It is longer than the other side. Here's the work.
Answer:
479
Step-by-step explanation:
342=2 portions
171=1 portion
2+5=7 portions in total
171 times 7=479
hope this helps
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<h3>Solution :</h3>

By cross multiply, we get






Therefore, answer is 
For #7 - part a: greatest common factor (GCF) is 5.
Part b: cross out everything BUT 10 & 20.