exam Maths Puzzle Numerical Ability

xsquared + 4x + 1 = 0

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exam Other Question

The members of a flying club plan to share equally the cost of a $200,000 airplane. The members want to 5 more people to join the club so that the cost per person will decrease by $2,000. How many members are currently in the club? twice the sum of 15 and a number?