An ore contains 25% of an alloy that has 90% iron. Other than this, in the remaining 75% of the ore, there is no iron. How many kilograms of the ore are needed to obtain 60 kg of pure iron?

• ক 300 kg
• খ 250 kg
• গ 275 kg
• ঘ 266.66 kg ✅ সঠিক উত্তর