exam Maths Puzzle Numerical Ability

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?

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exam Other Question
A nursery wants to mix two types of seeds, one type sells for 12 dollars per pound and the other sells at 20 per pound. To obtain 100 pounds of a mixture at 14 dollars per pound, how many pounds of each seeds are needed? t^2-9 over 5t+15

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