exam Maths Puzzle Numerical Ability

what is (y+4)(y-1)=0

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#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 A group of people want to share equally the cost of a $200,000 airplane. They want to find 5 more people to join their club so that the cost per person decreases by $2000. How many people are currently in the club?