exam Maths Puzzle Numerical Ability

^9
[ (y^2/3)(y^-5/6)]
-----------------------
[ (y^1/9) ]

(Hoping that reads correctly, but if I had to say it - it would read: y to
th

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translate into a algebraic equations :

1) A girl buys three apples and seven oranges for $4.56. If an orange costs $0.28 more than an apple, how much does each fruit cost?
John can solve 12 linear equations in just 20 minutes. at this rate how many can he solve in 1 hour