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This is a Before After question.

     Before      Transfer     After     
Fiction  3u=  90 – 1a 90 – 1a
Non fiction  5u = 150  -1a 150  – 1a
Total 8u = 240    

8u = 240

1u = 240 ÷ 8 = 30

3u = 3× 30 = 90

5u = 5 × 30 = 150

 

(90 – 1a) / 5  = (150 – 1a )/ 9

810 – 9a = 750 – 5a

810 – 750 = 9a – 5a

4a = 60

1a = 60 ÷ 4 = 15  

2a = 15 × 2 = 30 (total sold)

 

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