exam Maths Puzzle Numerical Ability

#24
Quality control
Over a period of time, the manufacturer of a Carmel-center candy bar found that 3.1% of the bars were rejected for imperfections
(a) If a candy bars are

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I need help simplifing this problem.

(x + 3)(2x - 1) (-x - 3 )(2x + 1)
________________ ÷ ____________________

x(x + 4) x

and

x^(2) -
i want to soultion as soon as possible