exam Maths Puzzle Numerical Ability

y-2-8 sqrt(y-2)+15=0

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BERMUDA TRIANGE HAS A PERIMETER OF 3075MI. THE SHORTEST SIDE MEASURES 75MI LESS THAN THE MIDDLE SIDE, AND THE LONGEST SIDE MEASURES 375MI MORE THAN THE MIDDLE SIDE. FIND THE LENGTHS OF THE THREE SIDES. 3 students, with different names,lineup single file. What is the probability that they are in alphabetical order from front-to-back?