A man mixes 5 liters of milk at Rs 60/ltr with 6 liters of milk at Rs 58/ltr.  How many liters of water should be added to make the average of mixture Rs.48/ltr?

1.5 2 2.5 3.25

2.5

Cost of milk when 2 quantities are mixed: \(\frac{(5 × 60) + (6 × 58)}{11}\) = \(\frac{648}{11}\) Now, using allegation method: So, in 11 ltr of milk, 2.5 ltr of water should be added.