book Maths Puzzle Numerical Ability

A car radiator holds 24 L of a 20% antifreeze solution. How much of the 20% solution should be drained and be replaced with pure antifreeze to give a 40% antifreeze solution?

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Please help me find the sum:-11+(-7) fing the roots of the equestion:x^2+4x+8?
1.fing the roots by using compliting the squar method?
2.fing the roots by using factorisation method?
3.fing the roots by usin graphic