exam Maths Puzzle Numerical Ability

Lynn invests 10,000$. in one account, he earns 6% interest, in the other, he earns 4.5%. How much did he invest in each account if he makes 570$ in one year?

PLEASE HELP!!!!!!!!!!!

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exam Other Question

How would I simplify?

(6a^2/7b^2)^-2
6x - 1 / 5 - 2x / 3 = 3

written as:

6x - 1 2x
------ - -- = 3
5 3