exam Maths Puzzle Numerical Ability

I know the sale price of something and the percentage, I want to find the original price......can you help?

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exam Other Question

why are variables useful in algebra?
What makes the use of variables difficult to understand?

Create one statement in english representing an algebraic relationship.
Can someone help me on the following problems. I would greatly appreciate it.
Thank you

x+3/x+6=x-5/x+2

x/x-1+5/x+1=3x/x^2-1

7/x-4+1/x+4=-5x/x^2-16