The length and breadth of a rectangular field are 80m and 60m recpectively.Two mutually perpendicular passage.one parllel to its length and having width 5m while other is parllel to its breadth having width 3m are left in the central part.What is the total cost of passage at the rate Rs.15 per square meter.What is the area rest part of field.
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answer are 15and 21
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