The cost price of 25 articles is the same as the selling price of 'm' articles. If the profit is 25% , then what is the value of 'm'?
Let the cost price of an article be C. Given the profit percentage is 25%. The selling price of the article will be 1.25C. Given that the cost price of 25 articles is equal to the selling price of m articles, let's frame an equation from this.
$$25\cdot C\ =\ m\cdot1.25\ C=>m=20$$