exam Maths Puzzle Numerical Ability

soybean meal is 12% protein; cornmeal is 6% protein. How many pounds of each should be mixed together in order to get 240lb mixture that is 10% protein

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Adult tickets for a play cost $20 and child tickets cost $8. If there were 33 people at a performance and the theater collected $468 from ticket sales, how many adults and how many children attended the play? A line that is perpendicular to this equation would have what slope? Y = 0.2X - 3