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Question

A mine supplies 10000 tons of copper ore, containing an average of 1.5 wt% copper, to a smelter every day. The smelter extracts 80% of the copper from the ore on the same day. What is the production of copper in tons/day?

The correct answer is
120

Copper Production Calculation from Ore

This solution outlines the steps to calculate the daily copper production based on the provided ore supply, copper content, and extraction efficiency.

Step 1: Calculate Total Copper Content in Ore

Determine the total amount of copper available in the daily ore supply.

  • Ore supplied daily: $10000$ tons
  • Average copper content: $1.5\%$ by weight
  • Total copper calculation: $ \text{Total Copper} = \text{Ore Supplied} \times \frac{\text{Copper Content}}{100} $ $ \text{Total Copper} = 10000 \text{ tons} \times \frac{1.5}{100} $ $ \text{Total Copper} = 150 \text{ tons} $

Therefore, the daily ore supply contains $150$ tons of copper.

Step 2: Calculate Actual Copper Production

Calculate the amount of copper extracted by the smelter, considering the extraction efficiency.

  • Total copper available: $150$ tons
  • Extraction efficiency: $80\%$
  • Copper production calculation: $ \text{Copper Production} = \text{Total Copper} \times \frac{\text{Extraction Efficiency}}{100} $ $ \text{Copper Production} = 150 \text{ tons} \times \frac{80}{100} $ $ \text{Copper Production} = 120 \text{ tons} $

The smelter produces $120$ tons of copper per day.

Conclusion

The daily production of copper is calculated by first finding the total copper in the ore and then applying the extraction efficiency.

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Important Questions from Percentage (Notes)

  1. 20% of a number is more than 20% of 620 by 210. The number is:
  2. Girish scored 572 marks in an examination and was 30 marks short of 28% of maximum marks. In the same examination, his friend scored 473 marks. What is the percentage of marks scored by his friend?
  3. Anubhav spent 14% of his income on electricity bills, 28% on rent and 18% on shopping. If $\frac{1}{4}$ th of the remaining amount is ₹5120, how much did he spend on electricity bills ?
  4. The total population of a town is 50,000. The number of males and females increases by 10% and 15% respectively and consequently the population of the town becomes 56,000. What was the number of males in the town?
  5. There is an increase of 30% in the number of people coming to a theatre after reducing the entry fee by 25% per person. How much change is expected in the total earnings?
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