A mixture of 40 liters of milk and water contains \(10 \%\) water. How much water should be added to this so that water may be \(20 \%\) in the new mixture?
A. \(6.5\) liters B. 5 liters C. 4 liters D. \(7.5\) liters
Correct Answer: B
Explanation
A mixture of 40 liters of milk \(=36\) liters of Milk and 4 liters of water \(=90: 10\) ratio Now the new mixture should be in the ratio of \(80: 20\) Hence \(80 \%\) is equivalent to 36 liters (no addition of milk is done) \(100 \%\) is \((36 / 80)^{*} 100=45\) liters of milk is present in the new mixture Thus water shall be added \(=(45-36-4)=5\) liters of water
