exam Maths Puzzle Numerical Ability

t^2-9 over 5t+15

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exam Other Question

I do not understand how to solve the following equation:
E = 4f, for f
The solution is f =
I feel as though I am missing some information in order to solve this.
Doesn�t the answer depend on what I choose e to be? Is The Sieve of Eratosthenes is used to find prime numbers