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% ?

80 litre
90 litre
95 litre
85 litre

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Number System
Find the greatest number which divides 83, 125 and 209 leaving the same remainder in each case.

42
17
23
19

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