Copper ore contains 8% copper. How much copper is contained in 260 tons of such ore.

To solve this problem, we introduce a conditional variable “X”, through which we denote the amount of copper in 260 tons of copper ore. Then, by the condition of the problem,. Let’s make the following proportion: X tons of copper are related to 8%, as 260 tons of copper ore are related to 100%. Based on this proportion, we will compose the following equation: X = 260 x 8/100. Solving this equation, we get X equal to 20.8 tons of copper.
Answer: 260 tons of copper ore contains 20.8 tons of copper.

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