book Maths Puzzle Numerical Ability

Hi Tutors:

Word problems for me are a work in progress. Please show me a step by step approach to understanding this problem.
"Area of a rectangle." The width of a rectangle

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book Other Question

Please help me perform this operation and simplify
6(16x^4)^(1/3)-5(2x)^(1/3)-2(250x^7)^(1/3)
Solve the nonlinear system:

2x^2+y^2= 6
x^2-4y^2= -15