exam Maths Puzzle Numerical Ability

Please help me solve this word problem:

If a boat uses 19 gallons of gas to go 73 miles, how many miles can the boat travel on 57 gallons of gas?

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exam Other Question

A gallon of paint will cover 300 sq ft. what lenght of an 8 ft high wall can be covered with 1 gallon of paint? If the quotient of three times a number and five is increased by four, the result is 34. Find the number.
This problem was on a work sheet, but I believe it is in chapter 1