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Question 71
Out of the total production of iron from hematite, an ore of Iron, 20% of the ore gets wasted, and out of the remaming iron, only 25% is pure iron. If the pure iron obtained if a year from a mine of hematite Was 80,000 kg then the quantity of hematite mined from that mine in the year is?
Solution
Let the quantity of hematite mined from the mine in a year = 100x
Wasted ore = 20% of 100x = 20x
Pure iron = 25% of (100x - 20x) = 20x = 80000
x = 4000
Hence, quantity of hematite mined from the mine in a year = 100x = 400000 kg
