Number System
If the sum of five consecutive even numbers A, B, C, D and E is 130, what is the product of A and E ?

660
720
780
840

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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
90 litre
95 litre
80 litre

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