exam Maths Puzzle Numerical Ability

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Evaluate fraction 2m-5n/n+3p if m = -2, n = 4, and p = -1.

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exam Other Question

25/75 = 1/x What amount of each mixture, one 95% alcohol and the other 15% alcohol, must be used to make 10 liters of a mixture which is 45% alcohol? what equation or equations will express this problem? I was thinking it would be this equation: 0.95x+0.15x=0.45