Question :
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?
1. 250 kg
2. 275 kg
3. 300 kg
4. 266.66 kg
Answer :
4 - 266.66 kg
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