উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।
ব্যাখ্যা ও সঠিক সমাধান
উত্তর:
84 liter
Amount of water in mixture = 20% of 140 = 20/100 of 140 = 28 liter
Amount of milk in mixture = 140 - 28 = 112 liter
For, new mixture, the amount of water remains the same.
Now, milk : water = 7 : 1
milk / water = 7 / 1
or, milk = 7 x water = 7 x 28 = 196 liter
So, more milk needed = 196 - 112 = 84 liter