exam Maths Puzzle Numerical Ability

a plant manager needs a solution of 77% herbicide to be mixed with a solution of 67% herbicide to form 30 liters of 74% solution. How many liters of the 77% solution must he use?

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Find the equation in standard form. with all integer coefficients, of the line perpendicular to 3x - 6y and passing through (-2,-1). If y=cuberoot (x) +2, fill in the following table for x = 0,1,2,3,4. Round to three decimal places where necessary

Explain why no negative values are chosen as values to substit