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This is a before after question. 

LCM 

1/2 = 3/6 (Going to use 1/3 of it)

  Before   Transfer  After 
A     3u -1u 2u
B 6u   6u

2u + 6u = 8

8u = 8

1u = 8 ÷ 8 = 1

6u = 6 × 1 = 6 kg

 

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