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Need help with this math question

Need help with this math question-example-1
User Mortb
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Answer: w = 61

Explanation:

If the wall is 456 cm then the carpenter has already used up 334 cm of the wall on the other book cases. So 456-334 = 122 and since both of the bookcases are going to be the same width you divide 122 by 2 which gives you 61. Hope this helps :).

User Karthik SWOT
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