Number System
Find the average of the following set of scores 450, 1050, 12, 390, 143, 286, 550, 999

485
490
495
480

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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
90 litre
95 litre

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