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The length of a rectangular blackboar...

The length of a rectangular blackboard is 8 m more than its breadth. If its length is increased by 7m and its breadth is decreased by 4 m, its area remains unchanged. The length and breadth of the rectangular blackboard is (a) 24m, 16m   (b) 20m, 24m   (c) 28m, 16m   (d) 28m, 20m

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