Question:The length of a blackboard is 8 cm more than its breadth. If the length is increased by 7 cm and breadth is decreased by 4 cm, the area remains the same. The length and breadth of the black board (in cms) will be : 

A `28, 20` 

B `34, 26` 

C `40, 32` 

D `56, 48` 

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