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This is a Fractional Before After question.

LCM (left)

4/5 × 3/4 = 12/20

   Before  transfer  after  transfer  after  
A 20u – 4u 16u +240 – 4u 240 + 12u
B 960 – 20u + 4u 960 – 16u – 240 + 4u 720 – 12u
Total  960    960   960

240 + 12u = 720 – 12u + 180

12u + 12u = 900 – 240

24u = 660

1u = 660 ÷ 24 = 27.5

20u = 27.5 × 20 = 550 (A)

960 – 550 = 410 (B)

550 – 410 = 140

 

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