book Maths Puzzle Numerical Ability

What is an example of a real world application of the quadratic formula?

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book Other Question

Trying to answer this: -X over 2 + 4=12 -x/2+4=12 Can you please explain the work on how to do this A certain vat contains 90 kgs. of powdered milk and 10 kgs. of sugar. How much sugar must be added to the mixture to make it 25% sweet?

I can't solve this problem. I need help.