exam Maths Puzzle Numerical Ability

A garden area is 30 ft long and 20 ft wide. A path of uniform width
is set around the edge. If the remaining garden area is 400 ft2, what is the width of the path?

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exam Other Question

: Determine the domain of the function f(x) = sqr 6-x

A. all real numbers
B. all positive real numbers
C. x 6
D. x < 6
multiply. (7-9x^6)^2