exam Maths Puzzle Numerical Ability

Solve each of the equations for x.
25x^2 = 13

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exam Other Question

How many liters of a 10% alcohol solution must be mixed with 40 L of a 50% solution to get a 40% solution? If c1 and c2 are independent events , show that the following pairs of events are also independent
1. c1 complement and c2
2. c1 complement and c2 complement