exam Maths Puzzle Numerical Ability

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?

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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 Please help me pick the correct answer.

If x-y=6 and 3x^2+3xy-6y^2=60, then 9x+18y=

Answers:
a) 12
b) 15
c) 20
d) 24
e) 30