exam Maths Puzzle Numerical Ability

solve: x/x^2 - 1 + 1/x - 1 = 1/x + 1

I could be wrong.... no solution?

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exam Other Question

How many pounds of extra-lean-hamburger that is 7% fat must be mixed with 30 pounds of hamburger that is 15% fat to obtain a mixture that is 10% fat? This was from standardized test (ASSET):

Tractors A,B, C & D are equipped identically. Together A,B & C can plow 180 acres in 2 hrs. How many acres can all 4 (A, B, C & D) plow in 3 hrs?