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একটি সংখ্যা অপর একটি সংখ্যার $\frac25$ গুণ। সংখ্যা দুইটির সমষ্টি $98$ হলে, সংখ্যা দুইটি নির্ণয় কর।

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মনে করি, একটি সংখ্যা $x$

$\therefore$ অপর সংখ্যাটি $x$ এর $\frac{2}{5}$$=\frac{2x}{5}$

প্রশ্নমতে,
$x+\frac{2x}{5}=98$

বা, $\frac{5x+2x}{5}=98$

বা, $\frac{7x}{5}=98$

বা, $7x=98 \times 5$

বা, $7x=490$

বা, $x=\frac{490}{7}$

$\therefore x=70$

সুতরাং একটি সংখ্যা $70$ এবং অপর সংখ্যাটি $\frac{2x}{5}$$=\frac{2\times70}{5}$$=\frac{140}{5}$$=28$

Answer: $70$ এবং $28$

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