book Maths Puzzle Numerical Ability

x+2x^2/x+2

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book Other Question

what is the ratio of the number of nickles in a quarter to the number of quarters in a dollar?(the possibilites are.....5/4, 5/25, 4/5, or none of these) Use Gaussian elimination to completely solve:
5x+2y+5z=78
-2x+3y-9z=-53
9x-3y+2z=25

My final answer looks like this:
1 0 0 4
0 0 1 8
0 1 0 9

I've been over and over my