book Maths Puzzle Numerical Ability

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

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book Other Question

During a publicity compaign, a cycle shop gave away 5000 miniature cycles and bumper stickers. The cycles cost $.63 each and the bumper stickers cost $.52 each. The cycle shop spen 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