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This is a Part whole question.

1. A = 3u.  B = 4u. C = 3u + 15.

   A    B       C     
Quantity    3u     4u 3u + 15
       

3u + 15 = 4u + 3

15 – 3 = 4u – 3u

1u = 12 

3u = 3 × 12 = 36

 

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Andrea to Bernice is 4:7 not 3:4

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