exam Maths Puzzle Numerical Ability

Computer City sells batteries ($3) and small boxes of pens ($5). In August, total sales were $960. customers bought 5 times as many batteries as boxes of pens. How many of each

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Multiply and Simplify x2 (squared)-x-20/x2 (squared)+x-6 multiplied by x2 (squared)+3x-10/x2(squared)+9x+20. You invest 10,000, part at 6% annual interest and the rest at 9% annual interest. If you received 684 in interest after one year, how much did you invest at each rate?