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Norma-Jean [14]
3 years ago
11

Each of a certain type of tire on a 4 wheel car lasts exactly 10,000 miles. How many spare tires of this same variety must carri

ed so that a trip of 15,000 miles can just be completed.
Mathematics
1 answer:
Lesechka [4]3 years ago
5 0
3 spare tires are needed. This works if you rotate the tires every 5,000 miles. 

Tire A, B, C, D (and spare is E F G)
first 5,000 miles you use tire A B C D
second 5000 miles you use tire B C D E
third 5000 miles you use A E F G

Each tires is used no more than twice (10,000 miles).
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