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This is a fractional internal transfer question. 

LCM  (left)

3/5 × 3/4 = 9/20

   Before Transfer  After   Transfer  After  
Amy  20u  – 8u  12u  + 112.5 – 3u 9u + 112.5 
Sophia  450 – 20u  + 8u 450 – 12u   -112.5 + 3u   337.5 – 9u
Total  450    450    450

9u + 112.5 = 270

9u = 270 – 112.5 = 157.5

1u = 17.5

20u = 20 × 17.5 = 350 stamps  

 

 

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