book Maths Puzzle Numerical Ability

The Regal Book Store has 100 overstocked books to sell. The manager is going to mark some of the books $2 each and the remaining books $3 each. How many books must be priced at each price to recieve $245?

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(x^2+2x)^2-5(x^2+2x)+6=0

and

x^1/2-11x^1/4+30

and

6x^3/5-24=0 I need help. I'm a landscape designer and carpenter. I lost my daily planner which had all the formulas that I use regularly in estimating jobs. I need a quick reference with the f