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Mrs Tan used 1/4 of 2/3kg of rice, she was left with 3/4 * ( 2/3) kg = 1/2 kg. Then she used another 1/6 kg, so  she was left with 1/2 – 1/6 = (3-1)/6 = 1/3 kg in the end. 

 

Your answer subtract 1/4 from 2/3, this is not correct.

As 1/4 is ratio here, meaning she used 1/4 of 2/3 kg of rice. Pls read the question carefully to avoid mistake.

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