book Maths Puzzle Numerical Ability

how many pints of a 40% salt solution must be added to 12 pints of 20% salt solution to end up with a 32% salt solution

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A top spins 200 revolutions/minute. Find the angular velocity in radians/second. This is the problem: Jane has 132 more marbles than Mary has. If their mother gives 25 marbles to each of them, Jane will have 5 times as many marbles as Mary. How