Rice worth Rs. 244 per kg and Rs. 252 per kg are mixed with a third variety in the ratio 3 : 2 : 1. If the mixture is worth Rs. 295 per kg, find the price of the third variety per kg (in Rs.).

A vessel has 20 litres of milk. From this vessel, 5 litres of milk is taken out and replaced by water. The process is repeated once more. Find the quantity of milk (in litres) remaining in the vessel.

A shopkeeper mixes 40 kg of rice costing ₹30/kg with 60 kg of rice costing ₹50/kg. What is the average price (in ₹/kg) of the mixture?