एक दुकानदार ₹240, ₹258 और ₹252 प्रति किग्रा मूल्य वाले तीन प्रकार के बीजों को 3 : 1 : 2 के अनुपात में मिलाता है। मिश्रण की औसत लागत प्रति किग्रा कितनी है?

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?