A teacher decided to put up a new blackboard in her classroom. The length and breadth of the board are l cm and b cm, respectively. (i) She decided to frame the board using a thick ribbon. If she needs 25 cm more ribbon than the perimeter of the blackboard, express the total ribbon length needed in terms of and . (ii) What will be the expenditure for making 50 such boards, if the carpenter charges ₹z per board?
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Answered by
42
i- Perimeter= 2(l+b)
therefore total ribbon length [2(l+b)+25] cm
ii- 50 boards= 50[2(l+b)+25] cm= [100(l+b)+1250] cm
hence total rate= ₹[100(l+b)+1250]z
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Answered by
13
Answer:
the cost of 50 black board = 50 z
length of ribbon = 2 (l+b)+25
Step-by-step explanation:
The cost of 1 blackboard is already given we only need to multiply
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