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This is a Quantity Each Product question. 

LCM

4/9

1/3 = 4/12

   Quantity  Each Product 
Wooden 9u 0.08 0.72u
Metal 12u 0.25 3u
Total 21u   3.72u

21u = 168

1u  = 168 ÷ 21 = 8

3.72u = 3.72 × 8 =  29.76 kg

 

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