exam Maths Puzzle Numerical Ability

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?

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exam Other Question

x to the 2nd + 7x + x to the 2nd - 4x
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x to the 2nd - 5x x to the 2nd - 5x
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?