exam Maths Puzzle Numerical Ability

[[[3y^2-2y-4=0}}}

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A rectangular garden has dimensions of 18 feet by 13 feet. A gravel path of uniform width is to be built around the garden. How wide can the path be if there is enough gravel for 516 square feet? Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo?