exam Maths Puzzle Numerical Ability

I need a simple reverse formula for the following

loan required :- (property value + guarantee amount) = 80% of loan required
eg. 500,000 :- (475,000 + X ) = 400,000
X =

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exam Other Question

the home work looks like this but i dont know how to do it at all the teacher explained it but i still dont get it. the questions are like... pr=xp i dont know how to do them..and some of them have numbers..how do you do both times Consider the system of inequalitites x - 2y < or = -1, 5x - 2y > or = -21, x - 2y > or = -9, and 3x + 2y < or = 13.

The < or = is like less than or equal too
The > or = is lik