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This is a Before After question.

LCM  (left)

7/10

   After  Reverse  Before transfer  After
Alice 7u  + 3u 10u – 7u 3u
Belinda  7u + 62 -3u 4u + 62 +7u 11u + 62
Total         14u + 62

11u + 62 = 3u   + 110

11u – 3u = 110 – 62

8u = 48

1u = 48 ÷ 8 = 6

11u = 11 × 6 = 66

66 + 62 = 128

14u = 14 × 6 = 84

84 + 62 = 146

128/146 = 64/73

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