Question

solve question number 4​

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.

Answer 2

hope it helps u.....