Number System
If the numberator of a fraction is increased by 50% and denominator by 20% the fraction become 9/15. What was the original fraction ?

3/5
12/25
13/25
6/7

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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% ?

17 litre
29 litre
21 litre
25 litre

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