exam Maths Puzzle Numerical Ability

Hello, I don't know if you can help me, or maybe re-direct me to someone who could. I had a test question not long ago and I consider myself "okay" at math except this question has

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Can you please help me figure this one out.

If I invested $10,000, part at 15% and part at 14%.
If the total interest at the end of the year is $1430, how much did I invest at 15%?

Thanks for your help
Find the point P on the plane 0x+1y-3z=8 closest to the point Q(2,-3,3).

P = ( , , )?????

Thank you guys!