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?

Name: 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?
Uploaded: 2026-04-05T16:22:55.220631+05:30
Duration: 1 min 57 s
Description: 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

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