quantitative aptitude test 102

Test # 102
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1. A rectangular pool 20 meters wide and 60 meters long is surrounded by a walkway of uniform width.If the total area of the walkway is 516 square meters, how wide, in meters, is the walkway?

Quantitative Aptitude
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have the gall to (do something)
to be arrogant enough to do something
The woman had the gall to ask me to be quiet after she had been talking loudly for an hour.
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