exam Maths Puzzle Numerical Ability

Simplify by combining like terms

2 sqrt (5x) + 5 sqrt (5x) - sqrt (5x)

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exam Other Question

At what point does the line (x+4)/2 = (y-6)/-1 = (z+2)/4 meet the co-ordinate planes?
thank you in advance... A garden area is 30ft long and 20 ft 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?