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The length of a rectangular blackboard is 8 cm more than its breadth .If its length is increased by 7 cm and breadth is decreased by 4 cm ,its area remains unchanged .Find the length and breadth of the rectangular blackboard?​

Answer»

L= 17×5/7 B= 1×2/7Step-by-step explanation:let breadth be xlength= 8+xlength is increased by 7 CM = 8+7+xbreadth is decreased by 4CM = x-4cm Area remains unchangedSo x+8x= 8+7+x+x-4=→ 9x-x-x= 8+7+4=→ 7x = 19=→ x = 19/7Length of the RECTANGULAR blackboard = 8+7+x = 8+7+19/7 = 17×5/7Breadth= x-4 = 19/7-4 = 1×2/7 Hope my answer helps you.



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