exam Maths Puzzle Numerical Ability

How many liters of a solution containing 22% sugar and how many liters of another solution containing 31% sugar must be mixed together to make 680 liters of solution containing 27% sugar?

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exam Other Question

i would like you to help me on this problem.
it is dealing with fractions in the substitution method.

solve by the substitution method:
m over 3 + For the quadratic function Q(x)=x^2+5x-36, determine the exact value of the minimum.