book Maths Puzzle Numerical Ability

A chemist added 90 liters of alcohol solution A to 108 liters of 22 percent alcohol solution to get 37 percent solution. Express the concentration of the solution A in percentage. Put % after your answer.

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True or False???

The union of the negative integers and the counting numbers is the set of integers??

Thanks Caroline Solve the following system of equations using Gaussian elimination (with a matrix) and back substitution, or by using Gauss-Jordan elimination.

3x + y - z = 0
x + y = 2z = 6
2x + 2y = 3z = 10