exam Maths Puzzle Numerical Ability

How many liters of a 20% alcohol solution should Maria mix with 50 liters of a 60% alcohol solution to obtain a 30% solution?

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exam Other Question

Need some help. 3 radical symbol x^2 = 4. This is what I got, but for some reason I don't think that's right, but I can't figure out where I went wrong. Can you please check and Find the y-intercept for the equation 2x+4y=20