49 litres of milk has 80 % milk concentration . How much

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49 litres of milk has 80 % milk concentration . How much

Home » Aptitude » Ratio, Proportion » Question

49 litres of milk has 80 % milk concentration . How much water be added to make its concentratio n 70% ?

1. 6 litres
2. 7 litres
3. 6.5 litres
4. 7.5 litres

Correct Option: B

The given milk has 80 % concentration of milk .
Water to be added has 0 % milk concentration .
Final concentration of solution is 70% .
By Alligation Rule ,

So , water should be added to the given milk in the ratio 10 : 70 or 1 : 7 .
∴ Quantity of water to be added = 1 " 49 ; 7 litres
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