Question

an ore contains 12% of copper how many kilograms of the ore are required to get 69 kg of copper​

Answer 1

Let the total quantity of the ore be 'x' kg

So, 12 % of that ore is copper.

According to the question.

(x*12)/100 = 69

12x/100 = 69

3x/25 = 69

3x = 69*25

3x = 1725

x = 1725/3 

x = 575 kg

So, 575 kg ore is required to get 69 kg of copper.

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