book Maths Puzzle Numerical Ability

Mr. Turner invested a sum of money at 7% and twice that sum at 3%. His yearly return was $390. How much did Mr. Turner invest at each rate?
(This problem is not from a textbook). Please help, Thank You

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book Other Question

Four Ladiess are waiting to cross a bridge at night. They can only cross the bridge 2 at a time and they must carry a lantern over and back or they will not be able to see. Lady A Can someone help me simplify the following problems

(-3x / 2y^3)^-2

and

(x^1/3 / x^5)^3

thanks