Number System
A basket contains eight white and ten black balls. Two draws of one ball each are made without replacement. What is the probability that one ball is white and the other ball is black ?

80/151
80/152
80/153
80/150

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Number System
In a 150-litre mixture of milk and water, the percentage of milk is 84%. How much water should be added so that the percentage of milk becomes 52.5% ?

85 litre
80 litre
95 litre
90 litre

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