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Mrs Cheng had 1.8 m ribbon.

Mdm Aini had (1.8 + 1.2)  m = 3 m ribbon.

In then end, Mdm Aini had 1.8 * 3 m = 5.4 m ribbon.

So Mdm Aini had bought (5.4 – 3) m = 2.4 m of ribbon. 

Note: your step on 3.0 + 1.8 = 4.8 is not correct. Pls read the question again and find out where you got confused. 

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