book Maths Puzzle Numerical Ability

3x^2=11x+4
Solve by using quadratic formula

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book Other Question

The diagonal of a square television screen measures 18 inches. What is the length of the sides? A pharmacists needs to obtain a 70% alcohol solution. How many ounces of a 30% alcohol solution must be mixed with 40 ounces of an 80% alcohol solution to obtain a 70% alcohol solution?