exam Maths Puzzle Numerical Ability

How do i solve 5x+9=30

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vicki is 1/3 as old as her cousin, chris, plus 5 years. Vicki is 14 years old. how pld is chris. The distance from Philadelphia to Sea Isle City is 100 miles. The tires on the car have a radius of 14inches. How many revolutions of each tire occured on the trip?