book Maths Puzzle Numerical Ability

How do I work out what percentage one figure is of another. i.e. If I have an overall figure (B) of 134,789 and part of this is A which equals 27,987 what percentge is A of B?

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The diagonal of a square television screen measures 18 inches. What is the length of the sides? A machine can produce article A in 12 minutes or article B in 16 minutes. If it is planned to produce twice as many of A as B in a working week of 40 hours, how many of each will b