book Maths Puzzle Numerical Ability

Karen Waugtal invested some money @ 9% annual simple interest and $250 more than that amount into a 10% simple interest. If her total yearly interest was $101, how much did she in

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find the mistake in the problem and fix it.
if y = 30 and h = 2

6(30) 6+2-5
6y h+6-5
6(15)+6-5
90+6-5
96-5
91 It has been many years since I have had algebra. Please point me in the right direction with this system of linear equation...

x + 2y - 7z = -1
3x + 7y - 24z = 6
x + 4y - 12z = 26

Thank you from Montgomery, AL