exam Maths Puzzle Numerical Ability

How many kilograms of antifreeze must be added to 10 kg. of 20% antifreeze solution to produce a 50% solution?

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exam Other Question

At a miniature golf course, a water hazard blocks the direct shot from the tee at T(0,0) to the cup at C(-2,8). If you hit the ball so it bounces off an angled wall at B(4,3), it w I have to solve this by completing the square
x^2 =5x+2
am I going to solve by the equation in the form of
ax^2+bx=k