Aman buy a certain number of litchis at 20 per rupee and equal number at 30 per rupee . he mixed them and sold them at 25 rupee . find his hair or loss percentage

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Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

()1. how do you find range? 2.the following set of data is to be organized into a histogram. if there are to be five intervals on the graph, what should the length of each interval be? 30, 34, 23, 21, 27, 25, 29, 29, 25, 23, 32, 31