Number System
The difference between 71% of a number and 46% and of the same number is 212. What is 75% of that number

636
845
724
673

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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% ?

95 litre
90 litre
80 litre
85 litre

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Number System
In a two-digit number, if it is known that its unit's digit exceeds its ten's digit by 2 and that the product of the given number and the sum of its digits is equal to 144, then the number is:

26
24
42
46

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