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  • 20-09-2020
  • Mathematics
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TheSection
TheSection TheSection
  • 20-09-2020

Answer:

Let the length of the first shelf = x

Length of second shelf = 2x + 18

Length of third shelf  = x - 12

Length of remaining shelf = x + 4

Since Robert has to use a board of 2.5 m , the sum of lengths of all these shelves should be 250 cm

So, x + 2x + 18 + x - 12 + x + 4 = 250

5x + 10 = 250

5x = 240

x = 48 cm

Therefore, the length of the first shelf should be 48 cm

Kindly Mark Brainly, Thanks

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