exam Maths Puzzle Numerical Ability

Solve this equation.
5^x^3 = 25^x
x =________________(smallest value)
x =
x =__________________(largest value

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exam Other Question
Given f(x)=2x-8, find f(3).

Thanks so much for the help. A garden area is 30ft long and 20ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400ft^2, what is the width of the path?

Gosh I am so lost on this one, thank you