book Maths Puzzle Numerical Ability

Find the probability of spinning a number on a spinner that the number with be even or a mulitple of 3. The spinner contains numbers 1 to 8. All sections equally divided.

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I get this far and then stuck and not sure if its right.

Simply and write answer in positive exponents only

(x^2)^-3 (x^-2) divided by (x^2)^4

My answer
x^-1 times x^- A farmer is mixing 2 types of beans. One sells for $.80 per pound and the other sells for $1.20 per pound. He wants to sell a mixture of beans for $1.10 per pound. He has 25 pounds