Solution
Think and LearnExplanation:Suppose the vessel initially contains 8 litres of liquid.
Let x litres of this liquid be replaced with water.
Quantity of water in new mixture = (3-3x/8+x)litres.
Quantity of syrup in new mixture = (5-5x/8) litres.
(3-3x/8+x)=(5-5x/8)
=> 5x + 24 = 40 - 5x
=> 10x = 16 => x = 8/5
So, part of the mixture replaced = (85×18) = 1/5.