exam Maths Puzzle Numerical Ability

ABCD is a parllelogram,AE perpendicular to DC and CF perpendicular to AD.If AB-16cm,AE=8cm and CF=10cm,find AD

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exam Other Question

x/6 + 1/8 is less than or equal to x/2 - 3/4 Solve. Answer in scientific notation.
6x-9-x^2<0