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Answer

  English books Chinese books
At first 2u 1u
Gave away 32 32
In the end 2u – 32 1u – 32
Ratio 4 1

 

2u – 32 = 4 × (1u – 32)

2u – 32 = 4u – 128

2u = 96

u = 48

(a) Number of English books at first -> 2u = 96

 

Number of Chinese books after giving away 32 -> u – 32 = 16

(b) Number of Chinese books left after selling ¼ -> ¾ × 16 = 12

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