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Mrs Lim baked 120 * 4/5 = 96 chocolate tarts and 120 – 96 = 24 strawberry tarts in the beginning. 

If she gave u chocolate tarts away, she was left with ( 96 -u ) tarts.

Given

 24 = 2 * (96 – u)

24 = 192 – 2u

2u = 168

u = 84

She gave 84 chocolate tarts to her neighbour. 

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