exam Maths Puzzle Numerical Ability

simplify:

(-5r^2t^5u^6)^3

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exam Other Question

Anne and Nancy use a metal alloy that is 24.9% copper to make jewelry. How many ounces of a 20% alloy must be mixed with a 27% alloy to form 100 ounces of the desired alloy? (y-sqrtx)(2y+sqrtx)