exam Maths Puzzle Numerical Ability

Please help in solving this problem: Simplify 3x4y-2/9x6y4

I tried to solve the problem and I came up with 3x[4]y[-2]/9x[6]y[4]=3x2y6

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-3(3X+1)<15 Angelo is paid double time for each hour he works over 40 hours in a week. Last week he worked 43 hours and earned $460. What is his normal hourly rate?