exam Maths Puzzle Numerical Ability

Using Gauss-Jordan elimination- solve following system of equations.

x+y+z=2
2x-3y+z=-11
-x+2y-z=8

I think it is x= 1/3, y=10/3, z=-5/3

Am I correct?
Thanks

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exam Other Question

Solve the linear inequality:

http://www.webassign.net/www23/symImages/2/d/87cadab0a0f76902a342858f18159d.gif Bob owns a watch repair shop. He has found that the cost of operating his shop is given by c(x)=4x^2-304x+71, where x is the number of watches repaired. How many watches must her repair to have the lowest cost?

Thanks.