# Answer the 7th question."PLEASE DON'T SEND THE SIMILAR QUERIES.KINDLY SEND THE APPROPRIATE AND STEP BY STEP CALCULATION.

$\mathrm{Let}\mathrm{the}\mathrm{total}\mathrm{number}\mathrm{of}20\mathrm{paise}\mathrm{coins}=\mathrm{x}\phantom{\rule{0ex}{0ex}}\mathrm{Then}\mathrm{number}\mathrm{of}25\mathrm{paise}\mathrm{coins}=38-\mathrm{x}\phantom{\rule{0ex}{0ex}}\mathrm{amount}\mathrm{with}20\mathrm{paise}\mathrm{coins}=\mathrm{Rs}0.20\mathrm{x}\phantom{\rule{0ex}{0ex}}\mathrm{amount}\mathrm{with}25\mathrm{paise}\mathrm{coins}=\mathrm{Rs}0.25\left(38-\mathrm{x}\right)=\mathrm{Rs}\left(9.5-0.25\mathrm{x}\right)\phantom{\rule{0ex}{0ex}}\mathrm{A}.\mathrm{T}.\mathrm{Q}\phantom{\rule{0ex}{0ex}}0.20\mathrm{x}+9.5-0.25\mathrm{x}=8.50\phantom{\rule{0ex}{0ex}}-0.05\mathrm{x}=-1\phantom{\rule{0ex}{0ex}}\mathrm{x}=20\phantom{\rule{0ex}{0ex}}\mathrm{So}20\mathrm{paise}\mathrm{coins}=20\phantom{\rule{0ex}{0ex}}\mathrm{and}25\mathrm{paise}\mathrm{coins}=38-20=18\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}$

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