Question

An ore consist of 18% of copper. How many kgs of ore is required to get 43kgs of copper?

Answer 1

Let The weight of ore required to get 43kgs of copper be xkg.
Now,
18*x/100 = 43
18x=4300
x=4300/18
= 238.888889 kg

Answer 2

Let the kg of ore be 100kg
suppose, there is 18kg of copper
Therefore, the required ore to make 43kgs of copper is
= 100 × 43/18
= 238.88 kg
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