Hello Raman,
As far as your question is concerned , you need to first read the question carefully because many students will commit mistake in visualising the question.
The question says 3/5 of the 1/2kg has been eaten so the final part of the case eaten is 3/5×1/2 which is equal to 3/10 kg. So the total part which is left over is 1/2-3/10 = 2/10 kg which is equivalent to 1/5 kg.
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