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    				| 1. | It is required to construct a big rectangularhall that can accommodate 400 people with25 m^(3) space for each person . The height of the wall has been fixed at 10 m and the total inner surfacearea of the walls must be 1300 m^(2) . What is the length and breadth of the hall ( in metres ) ? | 
| Answer» `30,20` | |