IBPS Clerk Prelims Model Paper 20

Suppose initial quantity of milk & water in the mixture are 5x & 4x,
then
2 litres water is added.
Hence,
New quantity of milk & water will be
5x & (4x + 2)
ATQ,
5x/(4x + 2) = 10/9
x/(4x + 2) = 2/9
9x = 8x + 4
x = 4
Hence, new amount of water in the mixture = 4x + 2 = (4×4) + 2 = 18 litres