exam Maths Puzzle Numerical Ability

Simplify:
Simplify and write the answer with all exponents positive).

(5x-3rd power d 4th power) (p 7th power d-1 power)2 power
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exam Other Question
An aircraft parts company has 130kg of an alloy that is 80% aluminum and 20% magnesium. How much pure magnesium should be added, so that the content is raised to 35%?

Please help, thanks! 3.3.3.3.y