exam Maths Puzzle Numerical Ability

identify the numerical coefficient of the term z

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exam Other Question

Is this problem solveable? Xsquared + X = 1

I have tried (x+1)(x)=1
(-X-1)(-X)=1
Xsquared = 1-x

Thanks A certain paint mixture sells for $3.40 per liter and contains white and red paint. The white paint is valued at $3.00 per liter and the red at $4.00 per liter. If 10 L of this mixture is needed, how much white and red must be used to make it?