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Mr Yadav bought 1/2 kg of sweets.After his children had eaten some, there was 1 / 10 kg left.How much had they eaten?

I need the answer

Please find below the solution to the asked query :

$\mathrm{Quantity}\mathrm{of}\mathrm{sweets}\mathrm{bought}\mathrm{by}\mathrm{Mr}.\mathrm{Yadav}=\frac{1}{2}\mathrm{kg}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\mathrm{Quantity}\mathrm{of}\mathrm{sweets}\mathrm{left}=\frac{1}{10}\mathrm{kg}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\mathrm{Quantity}\mathrm{of}\mathrm{sweets}\mathrm{eaten}\mathrm{by}\mathrm{children}=\frac{1}{2}-\frac{1}{10}=\frac{5-1}{10}=\frac{4}{10}=\frac{2}{5}\mathrm{kg}$

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