exam Maths Puzzle Numerical Ability

tutor could you help me please..my problem is: Solve (X1/5)^3

Thank you

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exam Other Question

The revenue for a sandwich shop is directly proportional to its advertising budget. When the owner spends $ 2000 a month on advertising , the revenue was 120,000 .If the revenue is now 180,000 , how much is the owner spending on advertising? Express 3log b x-4 log b y+1/2 log b z as a single logarithm and simplify if possible. I am at a total loss. Please help... Thank you very much in advance!