Answer:
10 liters
Step-by-step explanation:
Given the initial mixture contains 150 l of wine and water
Given the initial mixture contains 20% water,
=> 20% of 150
= 30 l
=> Out of 150 l mixture, 30 l is water and the rest 120 l is wine.
Suppose the volume of the extra water that needed to be added be 'x' liters
then, Total volume of the mixture becomes 150 + x,
wine remains same with 120 l
Also, given that water in the new mixture will be 25%
=> Wine in the new mixture should become 75%
=> 75 % of (150 + x) = 120
=>3/4(150 + x) = 120
=>450 + 3x = 480
=> 3x = 30
=> x = 10.
Thus , 10 liters of water need to be added so that water becomes 25% of the new mixture.