Answer:
51 miles
Explanation:
1 gallon = 3 miles
17 gallons = ? miles
17 * 3 = 51 miles
Boat with 7 gallons of gas = 21 miles
Boat with 1 gallon of gas = 21/7 = 3 miles
Boat with 17 gallons of gas = 17 x 3 = 51 miles
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