exam Maths Puzzle Numerical Ability

Could you please help me with the following problem? I am supposed to solve this equation using the quadratic formula. (1/y)-(1/y+5)=(1/4)

Thank you very much for any help you can provide.

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exam Other Question

The inventor of a new product believes that the cost of producing the product is given by the function
C(x)=1.75x+7000
How much does it cost to produce 2000 units of the inventi For what value of k does the equality hold

|1 0 4 | |1 0 4|
|3 0 9 |=k|3 0 9|?
|5 5 20| |5 5 20|

a. -1
b. 0
c. 1
d. 2