book Maths Puzzle Numerical Ability

what is the answer to -/***************** (the stars are a radical)
80 a7 b9 c11 d24

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book Other Question

The width of a rectangular window is 10 feet less than twice its length. If the perimeter is 28 feet, find the dimensions of the window. be sure to show all of the following.
a) l ge=3y gh=7y - 4 and eh=24