Number System
The difference between the two digit number and the number obtained by interchanging its digits is 54. The difference between the digits is?

6
4
Nothing can be said.
1

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Number System
In a five-litre mixture of milk and water the portion of water is 30%. How much milk should be added to the mixture so that the portion of water reduces to 5% ?

29 litre
17 litre
25 litre
21 litre

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