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Maths Puzzle
Numerical Ability
a container contains 8 liters of a mixture of water and salt. the mixture is 70% salt. how much pure salt must be added to make it 80% salt?
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I need to solve by completing the square.
3x squared - 6x = 27
First I would move the 27 to the other side to get
3x squared-6x-27=0
a = 3
B = -6
C = -27
I am not sure what to do now.
x/4 + 3x/5 = 17