exam Maths Puzzle Numerical Ability

If 5 apples in a barrel of 25 apples are rotten, what is the expected number of rotten apples in a random sample of 2 apples?

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exam Other Question

how many ounces of pure water must be added to 75 ounce of a 20% salt solution to make a salt solution which is 15% salt? Solve the following system of linear inequalities by graphing.
x + 2y < 3
2x - 3y < 6