exam Maths Puzzle Numerical Ability

A nurse has 1 liter of a solution that is 20% alcohol. How much pure alchol must she add to bring the solution up to a 25% concentration

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exam Other Question

Please help me find the other extreme of this: ratical 24 is the geometric mean between a and b. Find b if a=2 Algebraically determine the exact roots in simplest form for:
((6sqrt2)+2x/sqrt8x)=(sqrt8x/(6sqrt2)-2x)