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This is a Quantity Each Product question. 

LCM 

40% = 40/100 = 2/5 = 8/20

1/20

20 – 8 – 1 = 11

   Quantity  Each  Product  ratio 
Long  6 1u + 18  6u + 108 8
Short 11 1u 11u 11
Corner       1

(6u + 108)/ 8 = 11u/11

6u + 108 = 8u

8u – 6u = 108

2u = 108

1u = 54 chairs

 

 

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