exam Maths Puzzle Numerical Ability

Im stuck on this problem.
It says solve

12/√(5x+6)=√(2x+5)

Thanks so much

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exam Other Question

a fast food stand sells muffins and cookies. last monday the ratio of the number of muffins to the number of cookies sold was 16 to 13. a total of 145 muffins and cookies were sold. How many cookies were sold? Please help me solve this equation: { { { y = 5x 1/2 } } }