exam Maths Puzzle Numerical Ability

The width of a a rectangle is fixed 26cm. What length will make the perimeter greater than 94cm? The length must be greater than ??? cm.

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exam Other Question

Dr. Kingsley took 60 ounces of a 20% gold alloy and mixed it with a 30% gold alloy to get a 24% gold alloy. How many ounces of the 30% gold alloy did he use? Solve the system of nonlinear equations:
y = x^3 - 4x
y = -1/2x^2 + 2