Driving from Chester to Boxerville, you see a sign that says you have seven miles to go. If the total length of the trip is 45 m
iles, how many miles have you already traveled?
What is the unknown quantity in the example?
2 answers:
45 - 7 = 38
unknown quantity is the miles already traveled.
For the first part,
![45 - 7 = x](https://tex.z-dn.net/?f=45%20-%207%20%3D%20x)
![x = 38 mi](https://tex.z-dn.net/?f=x%20%3D%2038%20mi)
The unknown quantity was the distance you had already traveled.
Do you understand this? Or should I explain more explicitly?
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