exam Maths Puzzle Numerical Ability

can you help me solve by using the quadratic formula of x^2-4x-5=0?

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exam Other Question

The diffrence of a number c and 17 is more then 33. Write an ineqaulity to this promblem an outboard motor calls for a fuel mixture of gasoline and oil to be 50 to 1. That is, 50 parts of gasoline to 1 part of oil. How many pints of oil should be added to 6 gallons of gasoline?