exam Maths Puzzle Numerical Ability

A radiator holds 4 gallons of fluid. If it is fullwith a 20% solution how muchfluid should be drained and replaced with a 70% antifreeze mixture to result in a 50% mixture of antifreeze?

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exam Other Question
x(2x-x)+(3x+2)-(9x+9-3x)= Solve the system of equations:

2x+y=4
y=x^2-4x-11

And graph the system of equations: y=x^2-2
y=-2x+1 and label the point(s) of interse